JP2001218354A - Phase control switchgear - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To minimize the occurrence of transient inrush current and surge overvoltage due to opening and closing of a switchgear, which is severe for transformers such as transformers connected to a power system. SOLUTION: Between each phase of a three-phase power system, a circuit breaker 50 for each phase for supplying a power supply voltage to a transformer connected by using a [Delta] connection, an operating device for operating each circuit breaker independently on and off, and a circuit breaker. The reference phase detector 82 predicts the voltage waveform of each phase when the circuit breaker is turned on, the phase of the current waveform of each phase when the circuit breaker is cut off, The residual magnetic flux detector 83 predicts the residual magnetic flux of each phase of the transformer from the positive and negative stored contents of the current value. When the circuit breaker of each phase is turned on, each phase is turned on based on the predicted residual magnetic flux of each phase of the transformer. The system is provided with an optimal closing point prediction means 81 for predicting a closing electrical angle at which a surge generated at the time becomes minimum, and a closing operation start means 81 for opening and closing the circuit breaker at the predicted closing electrical angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer, such as a transformer, a shunt reactor, or a capacitor bank, connected to a transmission line of a power system by controlling the switching time of a power switch such as a circuit breaker 50. The present invention relates to a phase control switchgear which minimizes the occurrence of transient inrush current and surge overvoltage accompanying opening / closing of the switchgear which is severe for the switchgear.

[0002]

2. Description of the Related Art By controlling the closing phase of a power switchgear,
The inrush current and switching surge voltage generated at the time of closing are suppressed, and the arc time of the circuit breaker 50 is controlled, so that the arc breaker 50 is set to the arc time at which there is no restriking or the optimal breaking time.
Applications of a switchgear (circuit breaker 50) provided with a phase control switchgear that opens and closes a zero by performing a pole opening operation are expanding. For example, FIG. 24 shows a conventional example related to a closing phase control device of the circuit breaker 50 disclosed in Japanese Patent Application Laid-Open No. 3-156820,
FIG. 9 shows reference waveforms and operation timings of power supply voltages of the R, S, and T phases during closing operation.

In FIG. 24, 10 is a Y-connected transformer whose neutral point is grounded, 50 is a circuit breaker, and each contact in arc-extinguishing chambers 52a, 52b, 52c of the circuit breaker 50 is independently opened and closed. In order to enable polar operation, there are independent operating devices 54a, 54b, 54c, respectively. 72a, 72
Reference numerals b and 72c denote voltage measuring units for measuring R, S, and T phase power supply voltages, and reference numeral 80 denotes a phase control switchgear of the circuit breaker 50 including a reference phase detecting unit 82 and a calculation / operation control unit 81.

Next, the operation will be described. The power supply voltages of the R, S, and T phases are measured by the respective voltage measuring units 72a, 72b, and 72c, and are supplied to the reference phase detecting unit 8 of the phase control switchgear 80.
2 is sent. In the reference phase detector 82, R, S, T
The cycle of the power supply voltage zero point of the phase is detected, and a reference voltage zero point is set as a reference point T _standard . When the circuit breaker 50 receives a closing (closing) command, the arithmetic / operation control unit 81 of the phase control switchgear 80 controls the ambient temperature of the operating device, the operating force,
Closing operation time t predicted from control voltage measurement data
_Close and the pre-arc time t _prearc are calculated, and the preset target point of R, S, T phase input (for example, an electrical angle of 90 ° for a voltage peak) from the _target T _target to the reference point T _standard is calculated from: Predicted closing operation time t
_The operation synchronization time t _cont is calculated by subtracting _close and adding the preceding arc time t _prearc . The operation / operation control unit 81 of the phase control switchgear 80 gives a closing signal to each of the operation devices 54a, 54b, and 54c after the elapse of the operation synchronization time t _cont calculated from the reference point T _standard , so that each arc extinguishing chamber 52a , 52b, and 52c are controlled so as to independently perform a closing operation at a predetermined electrical angle capable of minimizing the switching surge phenomenon. From the control sequence described above, the closing control of the transformer and the closing control of the shunt reactor when there is no residual magnetic flux that can suppress the switching surge phenomenon by performing the closing of the circuit breaker 50 at the voltage peak,
By turning on the circuit breaker 50 at the zero voltage point, the control of turning on the capacitor bank and the turning on of the no-load transmission line, which can suppress the switching surge phenomenon, are put to practical use.

[0005]

In the conventional apparatus, the closing of the circuit breaker 50 is performed at the voltage peak, so that when there is no residual magnetic flux that can suppress the switching surge phenomenon, the closing control of the transformer and the switching of the shunt reactor are performed. Although the closing control was performed, it is actually difficult to suppress the switching surge phenomenon and operate the circuit breaker 50 at an optimum closing timing if there is residual magnetic flux in the core of the transformer (or shunt reactor) 10. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended for use in a case where a transformer (or shunt reactor) core has a residual magnetic flux which has been considered to be difficult to put to practical use. Shunt reactor) Provides a phase control device that predicts the residual magnetic flux of each phase and operates the circuit breaker at the optimal closing timing according to the residual magnetic flux of each phase to suppress transient switching surge phenomena. Is to do.

[0007]

According to the present invention, there is provided a phase control switchgear according to the present invention, which includes a Δ connection, a Y connection where a neutral point is directly grounded, and a neutral point which is not connected between phases of a three-phase power system. Each of the phases connected to the reactor components connected by using one connection method, interrupting the fault current and the load current of the reactor components, and inputting to the three-phase power system to excite the reactor components. A circuit breaker, voltage measuring means for measuring the voltage of each phase, current measuring means for measuring a current between the output poles of the circuit breaker, and operation of independently opening and closing the circuit breaker for each phase. The device, a temperature measuring unit provided in the vicinity of the operating device, the drive operating pressure and control voltage of each operating device of the circuit breaker of each phase are measured, and when the circuit breaker receives a switching pole command, The voltage measuring unit provided and the A reference for predicting a voltage waveform of each phase when the circuit breaker is turned on, a phase of a current waveform of each phase when the circuit breaker is turned off, and a periodic zero point from the voltage value and the current value measured by the current measuring unit. Phase detection means, and residual magnetic flux predicting means for storing the breaking time of the circuit breaker in each phase at the time of previous breaking and the sign of the current value immediately before breaking, and predicting the residual magnetic flux of each phase of the reactor component from the stored contents When,
When closing the circuit breakers of the respective phases, an optimum closing electrical angle at which a surge generated at the time of closing each phase is minimized based on a residual magnetic flux of each phase of the reactor component predicted by the residual magnetic flux predicting means. An optimal closing point estimating means, and a closing operation for starting the closing operation of the circuit breaker so that the circuit breaker is electrically closed at the applied electrical angle predicted and set by the optimal applying point estimating means. Pole operation start means.

Further, the residual magnetic flux predicting means according to the present invention, when the residual magnetic flux of the first interrupting phase first interrupted at the last interruption of the three-phase power system by the circuit breaker is determined to be zero, is interrupted next. The second interruption phase is 60 ° (1/6) of the first interruption phase.
If the current value immediately before the interruption of the first interruption phase is positive and the current value immediately before the interruption of the second interruption phase is negative, the residual magnetic flux of the second interruption phase is negative (for example, Magnetic flux -90%), and the third interrupting phase that is finally interrupted is interrupted with a delay of 60 ° (１ ／ cycle) of the second interrupting phase,
When the current value immediately before the interruption of the second interruption phase is negative and the current value immediately before the interruption of the third interruption phase is positive, it is determined that the residual magnetic flux of the third interruption phase is positive (for example, residual magnetic flux is 90%). Alternatively, when it is determined that the residual magnetic flux of the first interrupted phase that was first interrupted at the time of the previous interrupt is zero, the second interrupted phase that is interrupted next is the first interrupted phase.
When the current is interrupted at a delay of 60 ° (1/6 cycle) of the interrupting phase and the current value immediately before the interrupting of the first interrupting phase is negative and the current value immediately before the interrupting of the second interrupting phase is positive, the second interrupting is performed. It is determined that the residual magnetic flux of the phase is positive (for example, residual magnetic flux is 90%), the third interrupted phase that is finally interrupted is interrupted with a delay of 60 ° (（cycle) of the second interrupted phase, and the second interrupted. When the current value immediately before the interruption of the third phase is positive and the current value immediately before the interruption of the third interruption phase is negative,
When the residual magnetic flux of the third cutoff phase is negative (for example,
%).

The residual magnetic flux predicting means according to the present invention, when the residual magnetic flux of the first interrupted phase first interrupted at the time of the previous interrupt is determined to be zero, the second interrupted phase to be interrupted next is the first interrupted. When the current value immediately before the interruption of the first interruption phase is positive and the current value immediately before the interruption of the second interruption phase is positive, the second interruption phase is interrupted with a delay of 120 ° (１ ／ cycle) of the phase. Is determined to be negative (for example, residual magnetic flux -90%), and the third interrupted phase that is finally interrupted is 120 ° (1 °) of the second interrupted phase.
/ 3 cycle), when the current value immediately before the interruption of the second interruption phase is positive and the current value immediately before the interruption of the third interruption phase is positive, the residual magnetic flux of the third interruption phase is positive ( For example, when it is determined that the residual magnetic flux is 90%), or when it is determined that the residual magnetic flux of the first interrupted phase first interrupted at the previous interrupt is zero, the second interrupted phase interrupted next is the first interrupted phase. 120 ° (1 /
If the current value immediately before the interruption of the first interruption phase is negative and the current value immediately before the interruption of the second interruption phase is negative, the residual magnetic flux of the second interruption phase is positive (for example, 3 cycles). (The residual magnetic flux is 90%), the third interrupting phase that is finally interrupted is interrupted with a delay of 120 ° (１ ／ cycle) of the second interrupting phase, and the current value immediately before the interrupting of the second interrupting phase is When the current value immediately before the interruption of the third interruption phase is negative, the residual magnetic flux of the third interruption phase is determined to be negative (for example, residual magnetic flux -90%).

The residual magnetic flux predicting means according to the present invention inputs in advance the absolute values of the positive and negative residual magnetic fluxes.

Further, the residual magnetic flux predicting means according to the present invention sets the absolute values of the positive and negative residual magnetic fluxes to 80% to 90%, and when the inrush current value at the time of closing is larger than an assumed value, The set values of the positive and negative residual magnetic fluxes are increased or decreased so that the inrush current approaches the expected value.

In the phase switching control apparatus according to the present invention, the residual magnetic flux of each phase is determined to be zero, negative, or positive by the residual magnetic flux predicting means, and the surge generated at the time of each phase is minimized. (Closing pole) The electric angle is set to the input time of the first input phase and the second input phase according to the residual magnetic flux, and the input time of the third input phase is set by the optimum input point prediction means for estimating the time (electric angle). This is set at the same time as or later than the input time of the second input phase. In addition, the optimal input point prediction means of the phase switching control device according to the present invention includes:
The residual magnetic flux predicting means of the reactor component of each phase where the neutral point is directly grounded and Y-connected, sets the residual magnetic flux of the first interrupting phase to zero, the residual magnetic flux of the second interrupting phase to negative, and the residual magnetic flux of the third interrupting phase to negative. When predicting a closing (contact) time (electrical angle) at which the generated surge at the time of each phase closing is minimized based on the result predicted as positive,
The first input phase is a phase in which the residual magnetic flux is zero (first interrupting phase),
The second input phase is set to a positive phase in which the residual magnetic flux is positive, the third input phase is set to a negative phase in the residual magnetic flux, and the input time of the first input phase in which the residual magnetic flux is zero is set to an electrical angle of 90 °. (Voltage peak) or around 60 ° to 120 ° (voltage peak)
In addition, the input time of the second input phase in which the residual magnetic flux is positive is set to an electric angle near 75 ° or 60 ° to 90 °, and the input time of the third input phase in which the residual magnetic flux is negative is set to the second input. This is set at the same time as or later than the phase input time.

In the phase switching control apparatus according to the present invention, the optimum closing point predicting means may be configured such that the residual magnetic flux of the reactor component of each phase whose neutral point is directly grounded and Y-connected is connected to the residual magnetic flux of the first cutoff phase. Zero, the residual magnetic flux of the second blocking phase is negative,
When estimating the closing (pole closing) time (electrical angle) at which the generated surge at the time of closing each phase is minimized, based on the result of predicting that the residual magnetic flux of the shut-off phase is positive, the first applied phase is determined by the residual magnetic flux. Is set to zero (first cutoff phase), the second input phase is set to a negative residual magnetic flux phase, the third input phase is set to a positive residual magnetic flux phase, and the third input phase is set to a zero residual magnetic flux. The injection time of one injection phase is set at around the electrical angle of 90 ° (voltage peak) or 60 °
At about 120 ° (voltage peak), the input time of the second input phase in which the residual magnetic flux is negative is set to the electrical angle of 315 ° or the electrical angle of 300 ° to 330 °, and the third magnetic field in which the residual magnetic flux is positive is set. The input time of the input phase is set at the same time as or later than the input time of the second input phase.

In the phase switching control apparatus according to the present invention, the optimum closing point predicting means may include a residual magnetic flux predicting means for a reactor component of each phase of the Y connection having a neutral point directly grounded. Based on the result of predicting that the residual magnetic flux of the zero and the second interrupting phase is positive and that the residual magnetic flux of the third interrupting phase is negative, the closing (pole closing) time (electrical angle) at which the surge generated when each phase is turned on is minimized. When predicting the first input phase, the residual flux is set to a zero phase, the second input phase is set to a positive residual flux phase, and the third input phase is set to a negative residual flux phase. The injection time of the first input phase in which the residual magnetic flux is zero is set near the electrical angle of 90 ° (voltage peak) or the electrical angle of 60 ° to 120 °.
In addition, the injection time of the second injection phase in which the residual magnetic flux is positive is set near the electrical angle of 280 ° or the electrical angle of 260 ° to 300 °.
In addition, the input time of the third input phase in which the residual magnetic flux is negative is set to be the same as or later than the input time of the second input phase.

In the phase switching control apparatus according to the present invention, the optimum closing point predicting means is characterized in that the residual magnetic flux predicting means for the reactor component of the reactor component of each phase of the Y connection whose neutral point is directly grounded detects the residual magnetic flux of the first cutoff phase. Based on the result of predicting that the residual magnetic flux of the zero and the second interrupting phase is positive and that the residual magnetic flux of the third interrupting phase is negative, the closing (pole closing) time (electrical angle) at which the surge generated when each phase is turned on is minimized. When the first input phase is set, the residual flux is set to zero, the second input phase is set to the negative phase, and the third input phase is set to the positive phase. The injection time of the first input phase in which the residual magnetic flux is zero is set near the electrical angle of 90 ° (voltage peak) or the electrical angle of 60 ° to 120 °,
The injection time of the second input phase in which the residual magnetic flux is negative is set to an electrical angle of 40.
The closing time of the third input phase in which the residual magnetic flux is positive is set near or at an electrical angle of 20 ° to 60 ° at the same time as or later than the input time of the second input phase.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a phase control switchgear according to Embodiment 1 of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a phase control device of a circuit breaker 50 applied to the opening and closing of a Δ-connection transformer (or a shunt reactor) 10 according to the first embodiment, and a power supply voltage, a magnetic flux change, and a power supply of each phase R, S, and T. It shows the current. FIG.
, 10 is a transformer whose primary winding and secondary winding are Δ-connected, and 50 is a circuit breaker 50 that cuts off the power of each phase, and each contact in the arc-extinguishing chambers 52a, 52b, 52c of the circuit breaker 50. In order to enable the child to perform the opening and closing pole operation independently, it has independent operation devices 54a, 54b and 54c, respectively. 7
Reference numerals 2a, 72b, and 72c denote voltage measuring units that measure power supply voltages of the R, S, and T phases, and 74a, 74b, and 74c denote R, S, and
A current measuring unit for measuring a current flowing through each of the T phases, 80
A is a phase control switchgear of the circuit breaker 50 including a reference phase detector 82, a residual magnetic flux detector 83, and an operation / operation controller 81.

Next, the operation of the phase control device according to the first embodiment will be described. When the circuit breaker 50 is closed, the power supply voltages of the R, S, and T phases are output from the respective voltage measurement units 72a,
It is measured at 72b and 72c. On the other hand, the currents flowing through the R, S, and T phases respectively are the current measuring units 74a, 74b,
It is measured at 74c. Each measurement result is output to the reference phase detector 82 and the residual magnetic flux detector 83 of the phase control switchgear 80A.
Sent to As shown in FIG. 1, the phase common magnetic flux has a phase delayed by 90 ° from the phase power supply voltage. At the moment when the current reaches a peak, the magnetic flux also takes the maximum value. When an opening command is issued to the circuit breaker 50 to open each contact in each of the arc-extinguishing chambers 52a, 52b, 52c, the current of each phase goes to the current zero point every 1/6 cycle. As shown by the phase break point of No. 1, the current is cut off in the order of R phase → T phase → S phase. Now the first
When the R-phase is interrupted, the flux of the R-phase interrupted by the core of the Δ-connected transformer 10 has the same periodicity as before the interruption. Keep changing. Next, when the second interruption phase, here the T phase, is interrupted, this phase has the same polarity as the current value immediately before the interruption (in this T phase, since the current value is interrupted from negative, The residual magnetic flux becomes negative). Finally,
When the third interruption phase, here the S phase, is interrupted, this phase has the same polarity as the current value immediately before the interruption (in the case of this S phase, since the current value is interrupted from positive, the residual magnetic flux is (Positive) magnetic flux remains. Then, the magnetic flux of the first interrupting phase, here the R phase, which has changed, settles to zero. As described above, the residual magnetic flux of the core of the transformer 10 connected in Δ is:
Positive, negative, and zero can be determined by measuring the order of the interrupted phases and the polarity of the current immediately before the interruption by the reference phase detector 82 and the residual magnetic flux detector 83 of the phase control switchgear 80. . Therefore, the reference phase detecting unit 82 and the residual magnetic flux detecting unit 83 of the phase control switchgear 80A according to the first embodiment determine that the residual magnetic flux of the first interrupted phase that was first interrupted at the time of the previous interrupt is zero. The second cutoff phase to be cut off next is cut off with a delay of 60 ° (（cycle) of the first cutoff phase, the current value immediately before the cutoff of the first cutoff phase is positive, and the cutoff of the second cutoff phase When the immediately preceding current value is negative, the residual magnetic flux of the second cutoff phase is set to a negative value (for example, the residual magnetic flux −
90%), the third cut-off phase to be cut off last is cut off with a delay of 60 ° (６ cycle) of the second cut-off phase, and the current value immediately before the cut-off of the second cut-off phase is negative. , Third
When the current value immediately before the interruption of the interruption phase is positive, the residual magnetic flux of the third interruption phase is determined to be positive (for example, residual magnetic flux 90%).
Alternatively, on the contrary, the residual magnetic flux of the first interrupted phase that was first interrupted at the time of the previous interrupt is determined to be zero, and the second interrupted phase that is interrupted next is 60 ° (1) of the first interrupted phase. / 6 cycle), and when the current value immediately before the interruption of the first interruption phase is negative and the current value immediately before the interruption of the second interruption phase is positive, the residual magnetic flux of the second interruption phase is made positive ( For example, residual magnetic flux 9
0%), the third cut-off phase to be cut off last is cut off with a delay of 60 ° (６ cycle) of the second cut-off phase, and the current value immediately before the cut-off of the second cut-off phase is positive. If the current value immediately before the interruption of the third interruption phase is negative, the residual magnetic flux of this third interruption phase is determined to be negative (for example, residual magnetic flux -90%).
Alternatively, it is determined that the residual magnetic flux of the first interrupted phase first interrupted at the time of the previous interrupt is zero, and the second interrupted second magnetic flux is interrupted.
When the cutoff phase is cut off at a delay of 120 ° (１ ／ cycle) of the first cutoff phase, the current value immediately before cutoff of the first cutoff phase is positive, and the current value immediately before cutoff of the second cutoff phase is positive It is determined that the residual magnetic flux of the second interrupting phase is negative (for example, residual magnetic flux is -90%), and the third interrupting phase that is finally interrupted is interrupted with a delay of 120 ° (１ ／ cycle) of the second interrupting phase. When the current value immediately before the interruption of the second interruption phase is positive and the current value immediately before the interruption of the third interruption phase is positive, the residual magnetic flux of the third interruption phase is regarded as positive (for example, residual magnetic flux 90%). judge. Or
Conversely, it is determined that the residual magnetic flux of the first interrupted phase that was first interrupted at the time of the previous interrupt is zero, and the second interrupted phase that is interrupted next is 120 ° (1/3) of the first interrupted phase. cycle)
If the current value immediately before the interruption of the first interruption phase is negative and the current value immediately before the interruption of the second interruption phase is negative, the residual magnetic flux of the second interruption phase is made positive (for example, the residual magnetic flux 90). %), The third cut-off phase to be cut off last is cut off with a delay of 120 ° (１ ／ cycle) of the second cut-off phase, and the current value immediately before the cut-off of the second cut-off phase is negative, If the current value immediately before the interruption of the third interruption phase is negative, it is determined that the residual magnetic flux of this third interruption phase is negative (for example, residual magnetic flux -90%).

When the residual magnetic flux remains in the core of the transformer 10 Δ-connected as described above, the optimum closing angle of each phase for minimizing the switching surge is determined by the value of the residual magnetic flux of each phase and the input angle. It turns out that it can be decided unambiguously for all cases, depending on the order in which they are performed. Therefore, if a positive or negative residual magnetic flux remains, this value is determined in advance by a test. For example, it is possible to set the value to 80% for a positive value and to -80% for a negative value. If the absolute values of the positive and negative residual magnetic fluxes are known, the current measuring units 74a, 74b,
From the current behavior measured at 74c, since the residual magnetic flux of each phase can be predicted to be positive, negative, or zero in the sequence of the present embodiment, it is possible to determine the optimal closing angle of each phase. On the other hand, even when the absolute value of the residual magnetic flux is unknown, first, the positive value is set to 80%, while the negative value is set to -80%, and the inrush current of each phase for each closing control is set. Are measured by the current measuring units 74a, 74b, 74c, and when the value is larger than the assumed surge level, the phase control switchgear 8
0 can increase or decrease the absolute value of the residual current to lower the surge level. Input target point T _{target for} each phase
As shown in Table 1 of FIG. 6, for example, when the residual magnetic flux is injected from a positive phase (residual magnetic flux k%), the input target point of the first phase is set at the same time as the input time of the second input phase. Or before that, the residual magnetic flux is negative (residual magnetic flux −k
%), The input target point of the second phase is set to an electrical angle of 30 ° -cos ⁻¹ (k / 100) or a vicinity thereof (within ± 30 °). Is applied, the target point of the third phase is set to the electrical angle (89 + 3k / 20) ° or its vicinity (± 30) after (363 / 360-169k / 3600) cycles after the input of the second phase. Degrees). When another rejection target point T _target is _supplied from a phase where the residual magnetic flux is positive (residual magnetic flux k%), the input target point of the first phase is set to be the same as or earlier than the input time of the second input phase. Next, when a phase with zero residual magnetic flux is applied, the target input point of the second phase is set to an electrical angle of 60 ° or a vicinity thereof (within about ± 30 °). When the phase (residual magnetic flux -k%) is applied, after the second phase is applied, (−26 /
Electrical angle (274 + 360k / 7200) cycles (274
+ 7k / 20) ° or its vicinity (within ± 30 °)
Is set. Further, another input target point T _target
Sets the injection target point of the first phase to be the same as or earlier than the injection time of the second injection phase, and then sets the target point of the first phase to the negative phase (the residual phase Magnetic flux
k), the target point of the second phase is set to the electrical angle (146 + 46 k / 25) ° or its vicinity (± 3).
(Within about 0 °), and finally, when a phase having a positive residual magnetic flux (residual magnetic flux k%) is applied, (13) after the second phase is applied.
2 / 360-134k / 3600) cycle after electrical angle (375-195k / 100) ° or near (±
(Within about 30 °). Here, when a closing (closing) command is issued to the circuit breaker 50, the power supply voltages of the R, S, and T phases are measured by the respective voltage measuring units 72a, 72b, and 72c, and the voltage of the phase control switching device 80A is measured. The signal is transmitted to the reference phase detector 82. In the reference phase detector 82, R, S,
The period of the T-phase power supply voltage zero point is detected, and a reference voltage zero point is set as a reference point T _{st andard} . The operation / operation control unit 81 of the phase control switchgear 80A includes an operation device 54a,
The closing operation time t _close and the pre-arc time t _prearc predicted from the measured data of the ambient temperature, the operating force, and the control voltage of the 54b and 54c are calculated, and the preset R, S, and T phases are input. Target point T _target to reference point T
_From the time until _standard , the predicted closing operation time t
_The operation synchronization time t _cont obtained by subtracting _close and adding the preceding arc time t _prearc is calculated. The calculation / operation control unit 81 of the phase control switchgear 80
After elapse of the operation synchronization time t _cont calculated from the _{standard, a} closing signal is given to each of the operating devices 54a, 54b, 54c so that each contact in each of the arc-extinguishing chambers 52a, 52b, 52c minimizes the switching surge phenomenon. Control is performed such that the closing operation is performed independently at a predetermined electrical angle that can be suppressed. FIG. 2 shows a case where the phase-control switchgear 80A of the present embodiment independently controls the breakers 50 of each phase with respect to the Δ-connection transformer (or the shunt reactor) 10 (first closing phase). Represents the change in the voltage and current of the circuit breaker 50 with zero residual magnetic flux (S phase) and the change in the magnetic flux of the transformer (or the shunt reactor) 10 (here, the residual magnetic flux is assumed to be 100%).
Looking at this, in the first input phase and the second input phase, the R phase having a negative residual magnetic flux has an electrical angle of 30 ° of the circuit breaker 50 and the T phase having a positive residual magnetic flux has an electrical angle of 150 ° of the circuit breaker 50. And after 10.8 ms (50
Hz), the S phase having no residual magnetic flux is 10 electrical degrees of the circuit breaker 50.
It can be seen that the rush current to the transformer (or the shunt reactor) 10 is suppressed by being turned on at 4 °. FIG. 3 shows a phase control switchgear 80A according to the first embodiment.
Delta connection transformer (or shunt reactor)
In the case where the circuit breakers 50 of each phase are independently controlled to be turned on with respect to the power supply 10 (the first applied phase is an R phase with a negative residual magnetic flux), the voltage and current of the circuit breaker 50 and the transformer (or shunt reactor) 10 It shows a change in magnetic flux. Looking at this, the first input phase and the second input phase have a positive residual magnetic flux T T
The phase is S at an electrical angle of 300 ° of the circuit breaker 50 and the residual magnetic flux is zero
The phase is injected at an electrical angle of 60 ° of the circuit breaker 50, and the first
And after 7.2 ms (50 Hz) after the input of the two phases, the R phase having zero residual magnetic flux is injected at an electrical angle of 309 ° of the circuit breaker 50, so that the R phase enters the transformer (or the shunt reactor) 10. It can be seen that the current is suppressed. FIG. 4 shows a case where the phase control switchgear 80A according to the first embodiment controls the breaker 50 of each phase independently with respect to the Δ-connection transformer (or the shunt reactor) 10 (first closing). The phases indicate changes in the voltage and current of the circuit breaker 50 of the residual magnetic flux positive T phase and the magnetic flux of the transformer (or the shunt reactor) 10. Looking at this, in the first input phase and the second input phase, the R phase having a negative residual magnetic flux has an electrical angle of 330 ° of the circuit breaker 50, and the S phase having no residual magnetic flux has an electrical angle of 210 ° of the circuit breaker 50. 1.9 ms (50 Hz) after the input of the first and second phases, the R phase having zero residual magnetic flux is input at an electrical angle of 124 ° of the circuit breaker 50, and the transformer (or It can be seen that the inrush current to the shunt reactor 10 is suppressed. In the above example, even if the second phase and the third phase are not turned on at the same time, if only one of them is turned on, the surge suppression effect can be obtained even if the remaining phases are turned on at any time. Is the same. FIG. 5 shows a circuit breaker 50 when the phase-control switchgear 80A according to the first embodiment simultaneously controls the closing of each phase circuit breaker 50 with respect to the Δ-connection transformer (or shunt reactor) 10.
3 shows changes in the voltage and current of the transformer and the magnetic flux of the transformer (or shunt reactor) 10. It can be seen that the S phase having a residual magnetic flux of zero has an electrical angle of 240
°, T phase with positive residual magnetic flux is 120 ° electrical angle of breaker 50
Further, it can be seen that the inrush current to the transformer (or the shunt reactor) 10 is suppressed by the simultaneous injection of the R phase having a negative residual magnetic flux at the electrical angle of 0 ° of the circuit breaker 50.

Embodiment 2 Next, Embodiment 2 of the present invention
Such a phase control switching device 80B will be described with reference to the accompanying drawings. FIG. 7 shows a primary winding according to an embodiment of the present invention;
The phase control device of the circuit breaker 50 applied to the opening and closing of the Y-connection transformer (or shunt reactor) 10 whose neutral point is grounded for the secondary winding and the power supply voltage, magnetic flux change and current of each phase are also used. It is shown. In FIG. 7, 10 is a Y-connection transformer with a neutral point grounded, 50 is a circuit breaker 50,
In order to enable each contact in the arc-extinguishing chambers 52a, 52b, 52c of the circuit breaker 50 to independently perform the opening and closing pole operation,
It has independent operation devices 54a, 54b, 54c. Reference numerals 72a, 72b, and 72c denote voltage measuring units that measure the voltages of the respective R, S, and T phases, and reference numerals 74a, 74b, and 74c denote the respective R,
Current measuring unit for measuring the current flowing through the S and T phases, 80B
Is a phase control switchgear of the circuit breaker 50 comprising a reference phase detection unit, a residual magnetic flux detection unit 83 and an operation / operation control unit. Note that the phase control switching device 80 according to the present embodiment is
The configuration of B is the phase control switchgear 80A according to the first embodiment.
Is the same as Next, the operation will be described. Circuit breaker 50
Are closed, the power supply voltages of the R, S, and T phases are measured by the voltage measuring units 72a, 72b, and 72c, while the current flowing through each of the R, S, and T phases is The current is measured by the current measuring units 74a, 74b, and 74c, and is transmitted to the reference phase detecting unit 82 and the residual magnetic flux detecting unit 83 of the phase control switching device 80B. As shown in FIG. 7, the phase common magnetic flux has a phase delayed by 90 ° from the voltage. At the moment when the current reaches a peak, the magnetic flux also takes the maximum value. When an opening command is issued to the circuit breaker 50 to open each contact in each of the arc-extinguishing chambers 52a, 52b, 52c, the current of each phase goes to the current zero point every 1/6 cycle. As shown at the phase cut-off point 7, the current is cut off in the order of R phase → T phase → S phase.
Now, when the first cut-off phase, here the R-phase, is cut off, the magnetic flux of the cut-off R-phase is the same as before the cut-off due to the remaining two phases in the core of the transformer 10 connected in Y. Continue to change periodically. Next, when the second interruption phase, here the T phase, is interrupted, this phase has the same polarity as the current value immediately before the interruption (in this T phase, since the current value is interrupted from negative, The residual magnetic flux becomes negative).
Finally, when the third cut-off phase, here the S-phase, is cut off, this phase has the same polarity as the current value immediately before the cut-off (this S-phase).
In the case of the phase, the current value is cut off from positive, so that the residual magnetic flux is positive). Then, the magnetic flux of the first interrupting phase, here the R phase, which has changed, settles to zero. As described above, the residual magnetic flux of the core of the transformer 10 connected in the Y-connection is determined based on the order of the interrupted phases and the polarity of the current immediately before the interrupt, based on the reference phase detector 82 and the residual magnetic flux detector 83 of the phase control switchgear 80B. , It is possible to determine positive, negative and zero. Therefore, the reference phase detector 82 and the residual magnetic flux detector 83 of the phase control switchgear 80B of the present embodiment determine that the residual magnetic flux of the first interrupted phase first interrupted at the previous interrupt is zero, The second cut-off phase interrupted at 60 ° (1/6) of the first cut-off phase
If the current value immediately before the interruption of the first interruption phase is positive and the current value immediately before the interruption of the second interruption phase is negative, the residual magnetic flux of the second interruption phase is negative (for example, (Magnetic flux -90%), the third interrupted phase which is finally interrupted is interrupted with a delay of 60 ° (（cycle) of the second interrupted phase, and the current value immediately before the interrupted second interrupted phase Is negative and the current value immediately before the interruption of the third interruption phase is positive, it is determined that the residual magnetic flux of this third interruption phase is positive (for example, residual magnetic flux is 90%). Alternatively, on the contrary, the residual magnetic flux of the first interrupted phase that was first interrupted at the time of the previous interrupt is determined to be zero, and the second interrupted phase that is interrupted next is 60 ° (1) of the first interrupted phase. / 6
Cycle) with a delay. When the current value immediately before the interruption of the first interruption phase is negative and the current value immediately before the interruption of the second interruption phase is positive, the residual magnetic flux of the second interruption phase is determined to be positive (for example, the residual magnetic flux is 90%). At the same time, the third cut-off phase to be cut off last is cut off with a delay of 60 ° (１ ／ cycle) of the second cut-off phase, and the current value immediately before the cut-off of the second cut-off phase is positive, When the current value immediately before the interruption is negative, the residual magnetic flux of the third interrupting phase is determined to be negative (for example, residual magnetic flux -90%). Alternatively, it is determined that the residual magnetic flux of the first interrupted phase that was first interrupted at the time of the previous interrupt is zero, and the second interrupted phase that is interrupted next is 120 ° (サ イ ク ル cycle) of the first interrupted phase.
If the current value immediately before the interruption of the first interruption phase is positive and the current value immediately before the interruption of the second interruption phase is positive, the residual magnetic flux of the second interruption phase is negative (for example, the residual magnetic flux − 90%)
And the last shut-off phase is the second shut-off phase.
120 ° (１ ／ cycle) delay of the shut-off phase
When the current value immediately before the interruption of the second interruption phase is positive and the current value immediately before the interruption of the third interruption phase is positive, the residual magnetic flux of the third interruption phase is determined to be positive (for example, the residual magnetic flux is 90%). . Also,
Conversely, it is determined that the residual magnetic flux of the first interrupted phase that was first interrupted at the time of the previous interrupt is zero, and the second interrupted phase that is interrupted next is 120 ° (1/3) of the first interrupted phase. cycle)
If the current value immediately before the interruption of the first interruption phase is negative and the current value immediately before the interruption of the second interruption phase is negative, the residual magnetic flux of the second interruption phase is made positive (for example, the residual magnetic flux 90). %), The third cut-off phase to be cut off last is cut off with a delay of 120 ° (１ ／ cycle) of the second cut-off phase, and the current value immediately before the cut-off of the second cut-off phase is negative, If the current value immediately before the interruption of the third interruption phase is negative, it is determined that the residual magnetic flux of this third interruption phase is negative (for example, residual magnetic flux -90%). As described above, when the residual magnetic flux remains in the core of the Y-connected transformer 10 whose neutral point is grounded, the optimal closing angle of each phase that can minimize the switching surge is determined by the residual magnetic flux of each phase. It has been found that it can be uniquely determined in all cases, depending on the value and the order of injection. Therefore, if a positive or negative residual magnetic flux remains, this value is obtained in advance by a test. For example, 80% is positive for positive, and -8 is negative for negative.
0% and its value can be set. If the absolute values of the positive and negative residual magnetic fluxes are known, the current measuring units 74a, 74b, 74
From the current behavior measured at c, the residual magnetic flux of each phase is positive,
Since negative and zero can be predicted in the sequence of the present invention, it is possible to determine the optimal closing angle of each phase. On the other hand, even when the absolute value of the residual magnetic flux is unknown, initially, the positive value is set to 80%, and the negative value is set to -80%. To the current measuring units 74a, 74
b, 74c, and when the value is larger than the assumed surge level, the phase control switchgear 80 can decrease or increase the absolute value of the residual current to reduce the surge level. Closing target point T _target of each phase, as shown in Table 2 in FIG. 12, for example, if the residual magnetic flux is fed through a first blocking phase of zero, the closing target point of the first phase, voltage peak or a When the phase is set to the vicinity and then the phase in which the residual magnetic flux is positive (residual magnetic flux k%) is applied, the input target point of the second phase is set to (１ ／ + k / 900) after the input of the first phase.
When the electrical angle after the cycle is set to (60 + 39k / 100) ° or in the vicinity thereof (within about ± 30 °), and finally, when the negative phase is injected with the residual magnetic flux, the injection target point of the third phase is This is set at the same time as or after the input time of the two input phases. When another input target point T _target is input from a phase in which the residual magnetic flux is negative (residual magnetic flux-k%), the input target point of the first phase is set to an electrical angle θ = cos ⁻¹ (−k / 1
00) or its vicinity (within about ± 30 °). When the residual magnetic flux is −100%, the target point is at or near the voltage zero point, and when the residual magnetic flux is at −80%, the electric angle is at or near the electrical angle of 37 °, 143 °, 217 °, 323 °. Next, when a phase in which the residual magnetic flux is zero is input, the input target point of the second phase is set to (−) after the input of the first phase.
1/60 + k / 900) cycle electrical angle (234+
39k / 100) ° or its vicinity (within ± 30 °), and finally, when a phase with a positive residual magnetic flux is injected, the injection target point of the third phase is set to the injection time of the second injection phase. At the same time or later. Furthermore,
At another input target point T _target , the residual magnetic flux is positive (the residual magnetic flux k
%), The input target point of the first phase is set to an electrical angle θ = cos ⁻¹ (k / 100) or a vicinity thereof (within about ± 30 °). This target point is at or near the voltage zero point (± 30%) when the residual magnetic flux is 100%.
Degree), and when the residual magnetic flux is 80%, the electrical angle is 37
°, 143 °, 217 °, 323 ° or their vicinity (within ± 30 °). Next, when a phase in which the residual magnetic flux is negative (residual magnetic flux-k%) is input, the input target point of the second phase is set to (20/39 + k / 360) after the input of the first phase.
0) electrical angle after cycle (245 + 10k / 100) °
Alternatively, when the phase is set near (within ± 30 °) and finally the phase where the residual magnetic flux is zero is applied, the input target point of the third phase is set at the same time as or later than the input time of the second input phase. Is set. Here, when a closing (closing) command is issued to the circuit breaker 50, the power supply voltages of the R, S, and T phases are measured by the respective voltage measuring units 72a, 72b, and 72c, and the voltage of the phase control switching device 80B is measured. The signal is transmitted to the reference phase detector 82. In the reference phase detecting unit 82 detects the period of each R, S, the voltage zero point of the T-phase, a reference point T _{stan dard} set the voltage zero point as a reference. The operation / operation control unit 81 of the phase control switching device 80B includes the operation devices 54a, 54b, 5
Ambient temperature 4c, operating force, closing operation time t _close that is predicted from the measurement data of the control voltage, and thereby calculates the leading arc time t _Prearc, each preset R, S,
The operation synchronization time t _cont obtained by subtracting the predicted closing operation time t _close from the time from the input target point T _target of the T phase to the reference point T _standard and adding the preceding arc time t _prearc is calculated. I do. Phase control switchgear 80
The operation / operation control unit 81 of B operates the operation devices 54 after the operation synchronization time t _cont calculated from the reference point T _standard elapses.
a, 54b, and 54c are supplied with a closing signal so that each arc extinguishing chamber 52
Each of the contacts a, 52b, and 52c is controlled so as to independently perform a closing operation at a predetermined electrical angle capable of minimizing the switching surge phenomenon. FIG. 8 illustrates a case where the phase control switchgear 80B according to the second embodiment independently controls the breaker 50 of each phase independently with respect to the Y-connected transformer (or shunt reactor) 10 that is directly grounded. Changes in the voltage and current of the circuit breaker 50 (the first input phase is the S phase with no residual magnetic flux) and changes in the magnetic flux of the transformer (or shunt reactor) 10 (here, the residual magnetic flux is assumed to be 100%). It is.
It can be seen from the figure that the first input phase is an S phase in which the residual magnetic flux is zero, and is applied at the voltage peak point of the circuit breaker 50. After the first phase is applied, the T phase becomes 7.17 ms (50 Hz). Electric angle 99
It can be seen that the inrush current to the transformer (or the shunt reactor) 10 is suppressed by the simultaneous injection of the ° and R phases at the electrical angle of 339 °. FIG. 9 shows a case where the phase control switchgear 80B according to the second embodiment independently controls the breaker 50 of each phase independently with respect to the Y-connected transformer (or shunt reactor) 10 that is directly grounded. (First
The input phase indicates a change in the voltage and current of the circuit breaker 50 of the residual magnetic flux negative R phase) and the change of the magnetic flux of the transformer (or the shunt reactor) 10. Looking at this, the first input phase is input at the voltage zero point where the voltage of the circuit breaker 50 tends to increase in the R phase where the residual magnetic flux is zero, and after the input of the first phase,
After 1.86 ms (50 Hz), the T phase is simultaneously turned on at an electrical angle of 153 ° and the S phase is turned on at an electrical angle of 273 °, so that the inrush current to the transformer (or shunt reactor) 10 is suppressed. I understand. FIG. 10 shows a Y grounded directly by the phase control switchgear 80B of the second embodiment.
The voltage and current of the circuit breaker 50 when the breaker 50 of each phase is independently controlled to be connected to the transformer (or the shunt reactor) 10 of the connection (the first applied phase is a positive T phase). 3 shows a change in magnetic flux of a transformer (or a shunt reactor) 10. Looking at this, the first input phase is injected at a voltage zero point where the residual magnetic flux is positive T phase and the voltage of the circuit breaker 50 tends to decrease.
4.14 ms later (50 Hz), the S phase is simultaneously turned on at an electrical angle of 134 ° and the R phase is turned on at an electrical angle of 255 °, so that the inrush current to the transformer (or shunt reactor) 10 is suppressed. I understand. In the above example, even if the second phase and the third phase are not turned on at the same time, if only one of them is turned on, the surge suppression effect can be obtained even if the remaining phases are turned on at any time. Is the same. FIG.
Reference numeral 1 denotes interruption when the phase control switchgear 80B of the second embodiment simultaneously controls the closing of the circuit breakers 50 of each phase with respect to the Y-connected transformer (or shunt reactor) 10 directly grounded. 3 shows changes in the voltage and current of the transformer 50 and the magnetic flux of the transformer (or shunt reactor) 10. As can be seen, the voltage peak of the circuit breaker 50 in the S phase where the residual magnetic flux is zero, and the T phase where the residual magnetic flux is positive is 1 electrical angle.
It can be seen that the rush current to the transformer (or the shunt reactor) 10 is suppressed by the simultaneous injection of 50 ° and the R phase with a negative residual magnetic flux at an electrical angle of 30 °.

Embodiment 3 According to the third embodiment of the present invention.
The phase control switching device will be described with reference to the accompanying drawings. Figure
13 is a grounded neutral point according to the embodiment of the present invention.
Opened Y-connection transformer (or shunt reactor) 10
Phase for controlling the switching pole phase of circuit breaker 50 applied to closing
The control switchgear 80C and the power supply voltage of each phase
And the current. In FIG. 13, 10 is medium.
Transformer with a non-grounded Y-connected transformer, 50 is a circuit breaker 50
In the arc-extinguishing chambers 52a, 52b, 52c of the circuit breaker 50,
To allow each contact to open and close independently.
Independent operating devices 54a, 54b, 54c
Have. 72a, 72b and 72c are the respective R, S and T phase
The voltage measuring units 74a, 74b, 74c for measuring the pressure
A current measuring unit for measuring a current flowing through the R, S, and T phases;
C is a reference phase detector 82, a residual magnetic flux detector 83 and
And phase control of circuit breaker 50 composed of operation / operation control unit 81
It is a switchgear. Next, the operation will be described. Circuit breaker 5
When 0 is closed, the power supply voltages of the R, S, and T phases are
The voltage is measured by the voltage measuring units 72a, 72b, 72c.
On the other hand, the current flowing through each of the R, S, and T phases is
a, 74b, 74c, phase control switchgear
80B reference phase detector 82 and residual magnetic flux detector 83
Sent to As shown in FIG.
The phase is delayed by 90 ° from the voltage. Also, the current peaks
At the moment, the magnetic flux also takes the maximum value. Opening finger on breaker 50
Of the arc extinguishing chambers 52a, 52b, and 52c.
When the stylus is opened, the current of each phase is changed every 1/6 cycle.
Toward the current zero point, for example, the phase break point shown in FIG.
Thus, the current is interrupted in the order of R phase → T phase → S phase. Now
If the first interrupting phase, here the R phase, is interrupted,
In the core of the wired transformer, the remaining two phase current paths
The interrupted R-phase magnetic flux changes periodically as before the interruption.
Continue to evolve. Next, the second blocking phase, here the T phase
When shut off, this phase has the same pole as the current
(In the case of this T phase, the current value is cut off from negative.
And the residual magnetic flux becomes negative). Finally,
If the third interruption phase, here the S phase, is interrupted,
Phase has the same polarity as the current value immediately before interruption (the S phase
In this case, the current value is cut off from positive, so the residual magnetic flux is positive.
) Remains. And the first that changed
The magnetic flux of the blocking phase of the eye, here the R phase, settles to zero. this
As shown, the residual of the core of the ungrounded Y-connected transformer 10
The magnetic flux is determined by the sequence of the interrupted phases and the polarity of the current immediately before the interruption.
The reference phase detector of the phase control switchgear 80C and the residual
Positive, negative and zero are measured by the magnetic flux detector 83.
It is possible to determine. Therefore, the phase of the present invention
Reference phase detector 82 of control switchgear 80C and residual magnetism
The bundle detection unit 83 detects the first cut-off at the time of the previous cut-off.
The residual magnetic flux of the breaking phase is determined to be zero, and
The second cut-off phase is 60 ° of the first cut-off phase (1/6 cycle)
Current value that is interrupted with a delay and immediately before the interruption of the first interruption phase
Is positive, and the current value immediately before the interruption of the second interruption phase is negative,
The residual magnetic flux of the second blocking phase is negative (for example, residual magnetic flux is -90%)
And the last shut-off phase is the second shut-off phase.
It is shut off 60 ° (1/6 cycle) later than the shut-off phase.
The current value immediately before the interruption of the second interruption phase is negative,
If the current value immediately before the interruption is positive, the residual magnetism of this third interruption phase
The bundle is determined to be positive (for example, the residual magnetic flux is 90%). Or
Conversely, the first shut-off that was first shut off during the last shut-off
Judging the residual magnetic flux of the phase is zero and shutting off next
The second shutdown phase is 60 ° (1/6 cycle) later than the first shutdown phase
And the current value immediately before the interruption of the first interruption phase is
If the current value immediately before the interruption of the negative and second interruption phases is positive,
2 The residual magnetic flux of the interruption phase is determined to be positive (for example, residual magnetic flux is 90%).
And the last shut-off phase is the second shut-off
60 ° (1/6 cycle) delay of the phase,
Current value immediately before the interruption of the second interruption phase is positive, interruption of the third interruption phase
When the immediately preceding current value is negative, the residual magnetic flux of
It is determined to be negative (for example, residual magnetic flux -90%). Or
Residual magnetic flux of the first interrupted phase that was first interrupted during the previous interrupt
Is determined to be zero, and the second cutoff phase to be cut off next is the
Cut off at 120 ° (1/3 cycle) delay of one cut-off phase
In addition, the current value immediately before the interruption of the first interruption phase is positive,
If the current value immediately before the break of the phase break is positive,
If the residual magnetic flux is determined to be negative (for example, residual magnetic flux -90%)
In both cases, the third cut-off phase finally cut off is the second cut-off phase 12
It is shut off with a delay of 0 ° (１ ／ cycle) and the second
The current value immediately before the cutoff of the phase break is positive,
When the current value is positive, the residual magnetic flux of the third breaking phase
For example, the residual magnetic flux is 90%). Or vice versa
The residual of the first shut-off phase, which was first shut off during the previous shut-off,
The second interrupting phase, which is determined when the magnetic flux is zero and then interrupted next
Shuts off with a delay of 120 ° (１ ／ cycle) of the first shut-off phase
In addition, the current value immediately before the interruption of the first interruption phase is negative,
If the current value immediately before the cutoff of the cutoff phase is negative, the second cutoff phase
Is determined to be positive (for example, the residual magnetic flux is 90%).
In both cases, the third cut-off phase finally cut off is the second cut-off phase 12
It is shut off with a delay of 0 ° (１ ／ cycle) and the second
The current value immediately before the cutoff of the phase break is negative,
When the current value is negative, the residual magnetic flux of the third breaking
(For example, residual magnetic flux -90%). Neutral as above
Residual magnetic flux in the core of the Y-connected transformer 10 whose point is not grounded
Each switch can minimize opening and closing surges when
The optimal injection angle of the phase is the value of the residual magnetic flux of each phase and the injection angle
Depends on the order, but is unambiguously determined in all cases
It turned out that it could be set. So the positive or negative residual flux
If this remains, determine this value in advance in a test.
For example, a positive value is 80%, while a negative value is -80%.
The absolute value of the positive and negative residual magnetic flux can be set.
When the value is known, the current is measured by the current measuring units 74a, 74b, and 74c.
From the measured current behavior, the residual magnetic flux of each phase is positive, negative, and zero.
Optimum input of each phase as it can be predicted by the sequence of the present invention
The angle can be determined. On the other hand, the absolute value of the residual magnetic flux
First, 80% if positive, even if unknown
On the other hand, if the value is negative, it is set to -80%, and
The inrush current of each phase is measured by the current measuring units 74a, 74b, 74c.
And the value is larger than the expected surge level
In this case, the phase control switchgear 80
It is possible to lower the surge level by increasing or decreasing the log value.
You. Input target point T for each phase_targetIs shown in Table 3 of FIG.
For example, if the residual magnetic flux is in a positive (residual magnetic flux k%) phase,
When inputting from the first phase, the input target point of the first phase is
Set at the same time as or before the phase entry time, then
When inputting a phase in which the residual magnetic flux is negative (residual magnetic flux-k%),
The target injection point of the second phase is set at an electrical angle of 30 ° or near.
Beside (within ± 30 °), and finally the residual magnetic flux is zero
When inputting the phase of the second phase, the input target point of the third phase is set to the second phase.
An electrical angle of 90 ° or 1/2 cycle after
(Within ± 30 °). another
Input target point T_targetIndicates that the residual magnetic flux is positive (residual magnetic flux k%)
When inputting from the first phase, the input target point of the first phase is
2 Set the same or earlier than the input time of the input phase,
Next, when a phase in which the residual magnetic flux is zero is applied, this second phase
The insertion target point is set at an electrical angle of 270 ° or in the vicinity thereof (± 30 °).
Degree), and finally, the residual magnetic flux has a negative phase (residual
When applying the magnetic flux (−k%), (27) is applied after the second phase is applied.
2 / 360-k / 1800) cycle after the electrical angle (30
2-k / 5) ° or its vicinity (within ± 30 °)
To set. Furthermore, another input target point T
_targetIs applied from the phase where the residual magnetic flux is zero.
The input target point of one phase is set at the same time as the input time of the second input phase.
Or earlier, and then set the residual flux to a negative phase (residual
Magnetic flux-k%), the input target point of this second phase
With an electrical angle of 30 ° or its vicinity (within about ± 30 °)
And finally set the positive phase (residual magnetic flux k%)
When charging, (15 / 24-13k)
/ 2400) electrical angle after the cycle (375-195k /
100) ° or its vicinity (within ± 30 °)
Is what you do. Here, the closing (closing) finger is
When a command is issued, the voltage of each R, S, T phase
Measured by the measuring units 72a, 72b, 72c, the phase control is opened.
It is transmitted to the reference phase detector 83 of the closing device 80C. Standard
In the phase detection unit 82, the cycle of the voltage zero point of each of the R, S, and T phases
Is detected, and a voltage zero as a reference is set to set a reference point T
_{standa rd}And Calculation and operation of the phase control switchgear 80C
The control unit 81 controls the ambient temperature, operating force, and control voltage of the operating device.
Closing operation time t predicted from the measured data_close,
And preceding arc time t_prearcIs calculated and set in advance.
Input target point T for each of the determined R, S, and T phases_targetFrom standard
Point T_standardTo the estimated closing time
t _closeAnd the preceding arc time t_prearcTo
Operation synchronization time t obtained by addition_contIs calculated. phase
The calculation / operation control unit 81 of the control switchgear 80C has a reference point
T_standardOperation synchronization time t calculated from_contAfter
To each operating device 54a, 54b, 54c.
Then, each contact in each arc extinguishing chamber 52a, 52b, 52c is opened.
At a specific electrical angle that can minimize the closing surge phenomenon
It is controlled so as to perform a vertical closing operation. FIG.
The non-grounded Y connection is provided by the phase control switchgear 80C of mode 3.
For the line transformer (or shunt reactor) 10
When the breaker 50 of each phase is controlled independently (first
Phase is S phase with no residual magnetic flux) Voltage and current of circuit breaker 50
And magnetic flux of transformer (or shunt reactor) 10
(In this case, the residual magnetic flux is assumed to be 100%)
It is. Looking at this, the first input phase and the second input phase
Means that the R phase having a negative residual magnetic flux has an electrical angle of 30 ° of the circuit breaker 50.
And the T phase in which the residual magnetic flux is positive is the electrical angle 150 ° of the circuit breaker 50.
10 ms after the injection of the first and second phases
Later (50 Hz), the S phase having a residual magnetic flux of zero
Transformer (or shunt) when injected at an air angle of 90 °
That the inrush current to the reactor 10 is suppressed
Understand. FIG. 15 shows a phase control switchgear according to the third embodiment.
80C, a non-grounded Y-connected transformer (or
Road reactor) 10 for each phase circuit breaker 50 independently
When the injection control is performed (the first injection phase is the R phase with negative residual magnetic flux)
The voltage and current of the circuit breaker 50 and the transformer (or
3 shows a change in magnetic flux of the shunt reactor 10.
Looking at this, the first input phase and the second input phase have
The positive T phase is the 150 ° electrical angle of the circuit breaker 50,
S phase with zero flux is injected at the electrical angle 270 ° of the circuit breaker 50
14 ms after the introduction of the first and second phases (50H
In z), the R phase having no residual magnetic flux is the electrical angle 282 of the circuit breaker 50.
The transformer (or shunt reactor)
11) It can be seen that the inrush current to 10 is suppressed.
FIG. 16 shows the phase control switchgear according to the third embodiment.
Non-grounded Y-connected transformer (or shunt reactor)
In the case where the breaker 50 of each phase is controlled
(The first input phase is the positive T phase of the residual magnetic flux).
Voltage and current and transformer (or shunt reactor)
10) shows the change in the magnetic flux of No. 10. See this
And the first input phase and the second input phase have a negative residual magnetic flux R
The phase is the electrical angle 30 ° of the circuit breaker 50, and the residual magnetic flux is zero.
Is turned on at an electrical angle of 270 ° of the circuit breaker 50, and the first
And after 1.7ms (50Hz) after input of two phases
R phase with zero magnetic flux is applied at an electrical angle of 180 ° of the circuit breaker 50
To transformer (or shunt reactor) 10
It can be seen that the inrush current is suppressed. The above
In the example above, the second and third phases are not
If only one of the injection times is controlled,
The surge suppression effect is the same even when
is there. FIG. 17 shows a phase control switchgear according to the third embodiment.
A non-grounded Y-connected transformer (or shunt reactor)
Control of the circuit breakers 50 of each phase at the same time
Voltage and current of the circuit breaker 50 and the transformer
(Or shunt reactor) 10 indicates the change in magnetic flux
Things. Looking at this, it shuts off at the S phase where the residual magnetic flux is zero
The peak of the voltage of the heater 50 and the T phase having a positive residual magnetic flux have an electrical angle of 15
0 ° and R phase with negative residual magnetic flux are simultaneously at electrical angle of 30 °
Transformer (or shunt reactor) when turned on
It can be seen that the inrush current to 10 is suppressed.

Embodiment 4 FIG. Embodiment 4 A phase control switchgear according to Embodiment 4 of the present invention will be described. The circuit configuration of the device is the same as that shown in FIG. Next, the fourth embodiment
The operation of will be described. When the circuit breaker 50 is closed, the voltages of the R, S, and T phases are measured by the voltage measurement units 72a, 72a.
2b and 72c, while the current flowing through each of the R, S, and T phases is measured by each of the current measurement units 74a, 74b, and 74c, and the reference phase detection unit and the residual magnetic flux of the phase control switchgear 80. It is transmitted to the detection unit 83.

As shown in FIG. 7, the phase of each phase common magnetic flux is delayed by 90 ° from the voltage. At the moment when the current reaches a peak, the magnetic flux also takes the maximum value. When an opening command is issued to the circuit breaker 50 to open each contact in each of the arc-extinguishing chambers 52a, 52b, 52c, the current of each phase goes to the current zero point every 1/6 cycle. As shown in FIG. 7, the current is interrupted in the order of R phase → T phase → S phase.

Now, if the first cut-off phase, here the R-phase, is cut off, the cut-off magnetic flux of the R-phase before the cut-off is given by the remaining two current paths in the core of the Y-connected transformer. Continue the same periodic change as. Next, when the second interruption phase, here the T phase, is interrupted, this phase has the same polarity as the current value immediately before the interruption (in this T phase, since the current value is interrupted from negative, The residual magnetic flux becomes negative). Finally, when the third cut-off phase, here the S-phase, is cut off, this phase has the same polarity as the current value immediately before the cut-off (in the case of this S-phase, since the current value is cut off from positive,
The residual magnetic flux becomes positive). Then, the magnetic flux of the first interrupting phase, here the R phase, which has changed, settles to zero.

As described above, the residual magnetic flux of the core of the Y-connected transformer 10 whose neutral point is directly grounded determines the order of the phases to be interrupted and the polarity of the current immediately before the interruption by the reference of the phase control switchgear 80. Positive, negative, and zero can be determined by measuring with the phase detection unit and the residual magnetic flux detection unit 83.

Therefore, the reference phase detecting section 82 and the residual magnetic flux detecting section 83 of the phase control switchgear 80 according to the fourth embodiment set the residual magnetic flux of the first interrupted phase, which was first interrupted at the previous interrupt, to zero. At the same time, the second interrupting phase to be interrupted next is interrupted with a delay of 60 ° (１ ／ cycle) of the first interrupting phase, and the current value immediately before the interrupting of the first interrupting phase is positive, and the second interrupting is performed. When the current value immediately before the phase interruption is negative, the residual magnetic flux of the second interruption phase is determined to be negative, and the third interruption phase to be finally interrupted is 60 ° (１ ／ cycle) of the second interruption phase. When the current value immediately before the interruption of the second interruption phase is negative and the current value immediately before the interruption of the third interruption phase is positive,
The residual magnetic flux of the third interrupting phase is determined to be positive, or conversely, the residual magnetic flux of the first interrupting phase, which was first interrupted at the previous interrupting time, is determined to be zero, and is then interrupted. Second
The cutoff phase is cut off with a delay of 60 ° (１ ／ cycle) of the first cutoff phase, and the current value immediately before the cutoff of the first cutoff phase is negative,
When the current value immediately before the interruption of the second interruption phase is positive, the residual magnetic flux of the second interruption phase is determined to be positive, and the third interruption phase to be interrupted last is 60 ° (1/1/60) of the second interruption phase. 6 cycles)
When the current is interrupted with a delay and the current value immediately before the interruption of the second interruption phase is positive, and the current value immediately before the interruption of the third interruption phase is negative, the residual magnetic flux of the third interruption phase is determined to be negative.

As shown in Table 4 of FIG. 23, the input target point T _target of each phase is such that the residual magnetic flux of each phase is zero for the first cut-off phase, negative for the second cut-off phase, and positive for the third cut-off phase. Is determined, the input target point of the first phase is set to the voltage peak or its vicinity. Next, when the phase in which the residual magnetic flux is positive is input, the input target point of the second phase is set to the first target. 10 after phase input
When the electrical angle after 5/360 cycles is set at or near 75 ° (within about ± 15 °), and finally, when a phase with a negative residual magnetic flux is injected, the injection target point of the third phase is set to the second target point. This is set at the same time as or later than the input time of the input phase.

Another input target point T _target is the input of the first phase when it is determined that the residual magnetic flux of each phase is zero for the first interrupt phase, negative for the second interrupt phase, and positive for the third interrupt phase. Target point,
When the voltage is set at or near the voltage peak and then the residual magnetic flux is injected into the negative phase, the input target point of this second phase is
Electric angle 3 after 105/360 cycles from the first phase injection
Set to 15 ° or its vicinity (within ± 15 °),
Finally, when the phase with the positive residual magnetic flux is applied, the input target point of the third phase is set at the same time as or later than the input time of the second input phase.

Still another input target point T _target is, when it is determined that the residual magnetic flux of each phase is zero for the first cut-off phase, positive for the second cut-off phase, and negative for the third cut-off phase, respectively. When the input target point is set to the voltage peak or its vicinity, and then the phase in which the residual magnetic flux is positive is input, the input target point of the second phase is set to 70/360 cycles after the input of the first phase. When the electrical angle is set to 280 ° or its vicinity (within about ± 20 °), and finally, when the phase in which the residual magnetic flux is negative is injected, the injection target point of the third phase is set to the injection time of the second injection phase. Set at the same time or later.

Still another input target point T _target is, when it is determined that the residual magnetic flux of each phase is zero for the first cut-off phase, positive for the second cut-off phase, and negative for the third cut-off phase, respectively. When the input target point is set at or near the voltage peak and then a phase with a negative residual magnetic flux is input, the input target point of the second phase is set to 70/360 cycles after the input of the first phase. Set the electrical angle to 40 ° or its vicinity (within ± 20 °),
Finally, when the phase with the positive residual magnetic flux is applied, the input target point of the third phase is set at the same time as or later than the input time of the second input phase.

When the residual magnetic flux remains in the core of the Y-connected transformer 10 whose neutral point is grounded as described above, the optimal closing angle of each phase that can minimize the switching surge is as follows. Although it depends on the value of the residual magnetic flux and the order of application, it has been found that it can be uniquely determined in all cases.

Here, when a closing (closing) command is issued to the circuit breaker 50, the voltages of the respective R, S, and T phases are measured by the respective voltage measuring units 72a, 72b, 72c, and the phase control switching is performed. It is transmitted to the reference phase detector 83 of the device 80. The reference phase detection unit 82 detects the cycle of the voltage zero of each of the R, S, and T phases, sets a reference voltage zero, and sets the reference zero as a reference point T _standard .

The arithmetic and operation control unit 81 of the phase control switching device 80, the ambient temperature of the operating device, the operating force, closing operation time t _close that is predicted from the measurement data of the control voltage, and the prior arc time calculate t _Prearc while, each preset R, S, the reference point T from the closing target point T _target T-phase
_From the time until _standard , the predicted closing operation time t _cl
ose is subtracted and the preceding arc time t _prearc is added to calculate an operation synchronization time t _cont which is obtained.

The operation / operation control unit 81 of the phase control switchgear 80 gives a closing signal to each of the operation devices 54a, 54b, 54c after the elapse of the operation synchronization time t _cont calculated from the reference point T _standard, and Each contact in the arc chambers 52a, 52b, 52c is controlled so as to independently perform a closing operation at a predetermined electrical angle capable of minimizing the switching surge phenomenon.

FIG. 19 shows that the phase control switchgear according to the fourth embodiment firstly blocks the residual magnetic flux of each phase to a Y-connected transformer (or shunt reactor) directly grounded. The phase is determined to be zero, the second breaking phase is determined to be negative, the third breaking phase is determined to be positive, and the first closing phase is determined to have a residual magnetic flux of zero (first breaking phase) and the second closing phase is determined to be residual. When the magnetic flux is set to the positive phase and the third input phase is set to the negative phase of the residual magnetic flux, and the breaker of each phase is controlled independently, the voltage and current of the breaker and the transformer (or Of the magnetic flux of the road reactor) (here, the residual magnetic flux is assumed to be 80%)
It shows.

As can be seen from FIG. 19, the first input phase is an R phase having a residual magnetic flux of zero and is input at the voltage peak point of the circuit breaker. The S phase is supplied at an electric angle of 75 °, and the T phase is supplied at an arbitrary electric angle after the second phase is supplied.
It can be seen that the inrush current to the shunt reactor) is suppressed.

FIG. 20 shows that the phase control switchgear according to the fourth embodiment firstly blocks the residual magnetic flux of each phase to a directly grounded Y-connected transformer (or shunt reactor). The phase is determined to be zero, the second breaking phase is determined to be negative, the third breaking phase is determined to be positive, and the first closing phase is determined to have a residual magnetic flux of zero (first breaking phase) and the second closing phase is determined to be residual. When the magnetic flux is set to the negative phase, the third input phase is set to the residual magnetic flux positive phase, and the breaker of each phase is controlled to be turned on independently, the voltage and current of the breaker and the transformer (or Of the magnetic flux of the road reactor) (here, the residual magnetic flux is assumed to be 80%)
It shows.

As can be seen from FIG. 20, the first input phase is an R phase with zero residual magnetic flux, and is applied at the voltage peak point of the circuit breaker. 5.8 ms (50 Hz) after the first phase is applied. The T phase is supplied at an electrical angle of 315 °, and the S phase is supplied at an arbitrary electrical angle after the second phase is supplied, thereby suppressing an inrush current to a transformer (or a shunt reactor). You can see that.

FIG. 21 shows that the phase control switchgear of the present invention uses a Y-connected transformer (or a shunt reactor) directly grounded to reduce the residual magnetic flux of each phase to zero for the first cut-off phase. The second cut-off phase is determined to be positive, the third cut-off phase is determined to be negative, the first input phase is a phase in which the residual magnetic flux is zero (first cut-off phase), and the second input phase is a positive residual magnetic flux. Phase and the third input phase are set to the negative phase of the residual magnetic flux, and the voltage and current of the circuit breaker and the transformer (or shunt reactor) when the circuit breaker of each phase is controlled to be turned on independently It shows a change in magnetic flux (here, the residual magnetic flux is assumed to be 80%).

As can be seen from FIG. 21, the first input phase is an R phase with zero residual magnetic flux and is input at the voltage peak point of the circuit breaker, and 3.9 ms (50 Hz) after the input of the first phase. The T phase is applied at an electrical angle of 280 °, and the S phase is applied at an arbitrary electrical angle after the second phase is applied, thereby suppressing the inrush current to the transformer (or the shunt reactor). You can see that.

FIG. 22 shows that the phase control switchgear of the present invention uses a Y-connected transformer (or a shunt reactor) directly grounded to set the residual magnetic flux of each phase to zero for the first cutoff phase, The second cutoff phase is determined to be positive, the third cutoff phase is determined to be negative, the first input phase is a phase in which the residual magnetic flux is zero (first cutoff phase), and the second input phase is a negative residual magnetic flux. Phase and the third input phase are set as the positive phase of the residual magnetic flux, and the voltage and current of the circuit breaker and the transformer (or shunt reactor) when the breaker of each phase is controlled to be turned on independently It shows a change in magnetic flux (here, the residual magnetic flux is assumed to be 80%).

As can be seen from FIG. 22, the first input phase is an R phase having a residual magnetic flux of zero, and is input at the voltage peak point of the circuit breaker. The S phase is input at an electrical angle of 40 °, and the T phase is input at an arbitrary electrical angle after the input of the second phase.
It can be seen that the inrush current to the shunt reactor) is suppressed.

[0042]

As described above, the switching pole phase control interrupter of the present invention predicts the residual magnetic flux of each phase of the transformer (or the shunt reactor) 10 and responds to the residual magnetic flux of each phase. By operating the circuit breaker 50 at the optimal closing timing, it is possible to provide a phase control device capable of suppressing a transient switching surge phenomenon.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a circuit breaker, a phase control switchgear, and changes in current, voltage, and magnetic flux according to Embodiment 1 of the present invention.

FIG. 2 is a diagram illustrating changes in current, voltage, and magnetic flux when a transformer is turned on by the phase control switchgear according to the first embodiment of the present invention.

FIG. 3 is a diagram showing changes in current, voltage, and magnetic flux during control of transformer input by the phase control switchgear according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating changes in current, voltage, and magnetic flux during transformer closing control by the phase control switchgear according to the first embodiment of the present invention.

FIG. 5 is a diagram illustrating changes in current, voltage, and magnetic flux during transformer closing control by the phase control switchgear according to the first embodiment of the present invention.

FIG. 6 is a table showing target insertion points of the phase control switchgear according to the first embodiment of the present invention.

FIG. 7 is a diagram illustrating a circuit breaker, a phase control switchgear, and changes in current, voltage, and magnetic flux according to a second embodiment of the present invention.

FIG. 8 is a diagram illustrating changes in current, voltage, and magnetic flux when a transformer is turned on by a phase control switchgear according to a second embodiment of the present invention.

FIG. 9 is a diagram showing changes in current, voltage, and magnetic flux when controlling a transformer to be turned on by a phase control switchgear according to Embodiment 2 of the present invention;

FIG. 10 is a diagram showing changes in current, voltage, and magnetic flux when a transformer is turned on by a phase control switchgear according to a second embodiment of the present invention.

FIG. 11 is a diagram showing changes in current, voltage, and magnetic flux when a transformer is turned on by the phase control switchgear according to the second embodiment of the present invention.

FIG. 12 is a table showing target insertion points of the phase control switchgear according to the second embodiment of the present invention.

FIG. 13 is a diagram showing a circuit breaker 50, a phase control switchgear, and changes in current, voltage, and magnetic flux according to a third embodiment of the present invention.

FIG. 14 is a diagram showing changes in current, voltage, and magnetic flux at the time of transformer closing control by the phase control switching apparatus according to Embodiment 3 of the present invention.

FIG. 15 is a diagram showing changes in current, voltage, and magnetic flux at the time of transformer closing control by the phase control switchgear according to Embodiment 3 of the present invention.

FIG. 16 is a diagram showing changes in current, voltage, and magnetic flux when a transformer is turned on by the phase control switchgear according to Embodiment 3 of the present invention.

FIG. 17 is a diagram showing changes in current, voltage, and magnetic flux at the time of transformer closing control by the phase control switchgear according to Embodiment 3 of the present invention.

FIG. 18 is a table showing target insertion points of the phase control switchgear according to the third embodiment of the present invention.

FIG. 19 is a diagram showing changes in current, voltage, and magnetic flux at the time of transformer closing control by the phase control switchgear according to the fourth embodiment.

FIG. 20 is a diagram showing changes in current, voltage, and magnetic flux at the time of transformer closing control by the phase control switchgear according to the fourth embodiment.

FIG. 21 is a diagram showing changes in current, voltage, and magnetic flux at the time of transformer closing control by the phase control switchgear according to the fourth embodiment.

FIG. 22 is a diagram showing changes in current, voltage, and magnetic flux during control of transformer input by the phase control switchgear according to the fourth embodiment.

FIG. 23 is a table showing target insertion points of the phase control switchgear according to the fourth embodiment.

FIG. 24 is a diagram showing a phase control device and a closing operation sequence according to a conventional example.

[Explanation of symbols]

10 transformer, 50 circuit breaker, 52a, 52b, 52c
Arc extinguishing chamber for each phase of circuit breaker 50, 54a, 54b, 54c
Operating device for each phase of circuit breaker 50, 72a, 72b, 72
c Voltage measuring unit, 74a, 74b, 74c Current measuring unit, 80A, 80B, 80C Phase control switchgear, 81
Operation / operation control unit, 82 reference phase detection unit, 83 residual magnetic flux detection unit.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Haruhiko Kayama 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) in Mitsubishi Electric Corporation 5G028 FB03 FD02

Claims (36)

[Claims] 1. A reactor component connected between phases of a three-phase power system using any one of a Δ connection, a Y connection in which a neutral point is directly grounded, and a neutral point in a non-contact grounding manner. A circuit breaker for each phase, which is connected and shuts down a fault current and a load current of the reactor component, and is supplied to the three-phase power system to excite the reactor component, and a voltage for measuring a voltage for each phase. Measuring means, current measuring means for measuring a current between the poles of the outputs of the circuit breaker, an operating device for independently opening and closing the circuit breakers for each phase, and a temperature measuring section provided near the operating device , Measure the drive operating pressure and control voltage of each operating device of each phase breaker,
When the circuit breaker receives the switching pole command, from the voltage value and the current value measured by the voltage measurement unit and the current measurement unit provided for each phase, the voltage waveform of each phase when the circuit breaker is turned on Reference phase detecting means for predicting the phase and the periodic zero of the current waveform of each phase when the circuit breaker is shut off; and And residual magnetic flux predicting means for predicting the residual magnetic flux of each phase of the reactor component from the stored content.When the circuit breaker of each phase is turned on, the residual magnetic flux predicted by the residual magnetic flux predicting means is stored. Based on the residual magnetic flux of each phase, an optimum input point prediction means for predicting an optimum input electric angle at which the generated surge at each phase input is minimized; and an input electric angle predicted and set by the optimum input point prediction means. At the As the cross-sectional device is electrically turned on, phase control switching apparatus characterized by comprising a closing operation start means for starting the closing operation of the breaker. 2. The residual interruption predicting means determines that the residual magnetic flux of the first interruption phase first interrupted at the last interruption of the three-phase power system by the circuit breaker is zero, and then interrupts the second interruption. The phase is 60 ° electrical angle of the first breaking phase
(1/6 cycle) When the current value immediately before the interruption of the first interruption phase is positive and the current value immediately before the interruption of the second interruption phase is negative, the residual magnetic flux of the second interruption phase is reduced. It is determined to be negative (for example, residual magnetic flux -90%), and the third cutoff phase finally cut off is the electrical angle 60 of the second cutoff phase.
When the current value immediately before the interruption of the second interruption phase is negative and the current value immediately before the interruption of the third interruption phase is positive, the residual magnetic flux of the third interruption phase Is determined to be positive (for example, 90% residual magnetic flux), or when the residual magnetic flux of the first interrupted phase first interrupted at the previous interrupt is determined to be zero, the second interrupted phase interrupted next is the first interrupted phase. Electrical angle of the breaking phase 60 °
(1/6 cycle) When the current value immediately before the interruption of the first interruption phase is negative and the current value immediately before the interruption of the second interruption phase is positive, the residual magnetic flux of the second interruption phase is reduced. It is determined to be positive (for example, residual magnetic flux is 90%), and the third cutoff phase finally cut off is the electrical angle
When the current value immediately before the interruption of the second interruption phase is positive and the current value immediately before the interruption of the third interruption phase is negative, the residual magnetic flux of the third interruption phase 2. The phase control switchgear according to claim 1, wherein the phase control switchgear is determined to be negative (for example, residual magnetic flux −90%). 3. When the residual magnetic flux predicting means determines that the residual magnetic flux of the first interrupted phase first interrupted at the previous interrupting time is zero, the second interrupted phase to be interrupted next is the electric power of the first interrupted phase. Corner 120
If the current value immediately before the interruption of the first interruption phase is positive and the current value immediately before the interruption of the second interruption phase is positive, the residual magnetic flux of the second interruption phase Is determined to be negative (for example, residual magnetic flux -90%), and the third cutoff phase finally cut off is the electrical angle 12 of the second cutoff phase.
If the current is interrupted with a delay of 0 ° (１ ／ cycle) and the current value immediately before the interruption of the second interruption phase is positive, and the current value immediately before the interruption of the third interruption phase is positive, the third interruption phase remains. When the magnetic flux is determined to be positive (for example, residual magnetic flux is 90%), or when the residual magnetic flux of the first interrupted phase that was initially interrupted at the previous interrupt is determined to be zero, the second interrupted phase that is interrupted next is the second interrupted phase. Electrical angle 120 of one breaking phase
If the current value immediately before the interruption of the first interruption phase is negative and the current value immediately before the interruption of the second interruption phase is negative, the residual magnetic flux of the second interruption phase Is determined to be positive (for example, residual magnetic flux is 90%), and the third interrupted phase finally interrupted is the electrical angle 12 of the second interrupted phase.
When the current is interrupted with a delay of 0 ° (１ ／ cycle) and the current value immediately before the interruption of the second interruption phase is negative and the current value immediately before the interruption of the third interruption phase is negative, the third interruption phase remains. The phase control switchgear according to claim 1, wherein the magnetic flux is determined to be negative (for example, residual magnetic flux -90%). 4. The phase control switching device according to claim 2, wherein said residual magnetic flux predicting means inputs in advance absolute values of positive and negative residual magnetic fluxes. 5. The residual magnetic flux predicting means sets absolute values of positive and negative residual magnetic fluxes to 80% to 90%,
If the inrush current value at closing is larger than the expected value,
The phase control switchgear according to claim 2, wherein the set values of the positive and negative residual magnetic fluxes are increased or decreased so that the inrush current approximates an assumed value. 6. The optimum input point predicting means, wherein the residual magnetic flux predicting means of each phase of the Δ-connected reactor component sets the residual magnetic flux of each phase to zero (0%) and negative (residual magnetic flux −k, respectively).
%) And positive (residual magnetic flux k%), when predicting the closing time at which the surge generated at the time of each phase input is minimized, the first input phase is defined as a phase in which the residual magnetic flux is positive, The second input phase is set to a phase in which the residual magnetic flux is negative, the third input phase is set to a phase in which the residual magnetic flux is zero (first cutoff phase), and the input of the first input phase in which the residual magnetic flux is positive. The time is set to any timing before or at the same time as the second phase input time, and the input time of the second input phase in which the residual magnetic flux is negative (residual magnetic flux-k%) is set to the electrical angle (-184 + 46k / 25). ° ~ (-1
24 + 46k / 25) ° or electrical angle −cos ⁻¹
(K / 100) to 60 ° -cos ^-1 (k / 100) °
In addition, the injection time of the third injection phase in which the residual magnetic flux is zero is changed to an electrical angle (5
3. The phase control switchgear according to claim 2, wherein the angle is set to 9 ° + 3 k / 20) ° to (119 + 3 k / 20) °. 4. 7. The optimum input point predicting means includes means for predicting a residual magnetic flux of a reactor component of each phase connected to each other in a Δ (0%) and negative (residual magnetic flux −k).
%) And positive (residual magnetic flux k%), when predicting the closing (pole closing) time (electrical angle) at which the surge generated at each phase is minimized, the first closing phase Is set as the negative residual magnetic flux phase, the second input phase is set as the positive residual magnetic flux phase, the third input phase is set as the zero residual magnetic flux phase (first cutoff phase), and the residual magnetic flux is set as negative. Is set at the same time as or before the second phase input time, and the second input phase input time when the residual magnetic flux is positive (residual magnetic flux k%) is set to Angle (-64 + 46k / 25) °-(-4 + 4
6k / 25) ° or electrical angle of 120 ° -cos ^-1
(K / 100) ° to 180 ° -cos ^-1 (k / 100)
In °, the injection time of the third injection phase in which the residual magnetic flux is zero is set to the electrical angle (5
3. The phase control switchgear according to claim 2, wherein the angle is set to 9 ° + 3 k / 20) ° to (119 + 3 k / 20) °. 4. 8. The optimum input point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase connected to each of the Δ-connections sets the residual magnetic flux of each phase to zero (0%) and negative (residual magnetic flux −k, respectively).
%) And positive (residual magnetic flux k%), when predicting the closing (closing) time (electrical angle) at which the surge generated at the time of each phase is minimized, the first closing phase Is set as the phase in which the residual magnetic flux is positive, the second input phase is the phase in which the residual magnetic flux is zero (the first cutoff phase), the third input phase is the phase in which the residual magnetic flux is negative, and the residual magnetic flux is positive. Is set at the same time as or before the second phase input time, and the input time of the second input phase in which the residual magnetic flux is zero is set to an electrical angle of 90.
The angle of injection of the third input phase having a negative residual magnetic flux is set to an electrical angle (2 ° to 30 °).
The phase control switchgear according to claim 2, wherein the angle is set to 44 + 7k / 20) ° to (304 + 7k / 20) °. 9. The optimum input point predicting means includes means for predicting the residual magnetic flux of the reactor component of each of the Δ-connected phases by setting the residual magnetic flux of each phase to zero (0%) and negative (residual magnetic flux −k, respectively).
%) And positive (residual magnetic flux k%), when predicting the closing (pole closing) time (electrical angle) at which the surge generated at each phase is minimized, the first closing phase Is set to a phase in which the residual magnetic flux is zero (first breaking phase), a second input phase is set to a positive phase of the residual magnetic flux, a third input phase is set to a negative phase of the residual magnetic flux, and the residual magnetic flux is set to zero. Is set at the same time as or before the second phase input time, and the second input phase input time when the residual magnetic flux is positive (residual magnetic flux k%) is set to At an angle of 330 ° to 270 °, the injection time of the third injection phase in which the residual magnetic flux is negative is set to the electrical angle (2
The phase control switchgear according to claim 2, wherein the angle is set to 44 + 7k / 20) to (304 + 7k / 20) °. 10. The optimum input point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each of the Δ-connected phases sets the residual magnetic flux of each phase to zero (0%) and negative (residual magnetic flux −k, respectively).
%) And positive (residual magnetic flux k%), when predicting the closing (closing) time (electrical angle) at which the surge generated at the time of each phase is minimized, the first closing phase Is set to a phase in which the residual magnetic flux is zero (first breaking phase), a second input phase is set to a negative phase in the residual magnetic flux, a third input phase is set to a positive phase in the residual magnetic flux, and the residual magnetic flux is set to zero. At the same time as or before the second phase injection time, and set the input time of the second input phase having a negative residual magnetic flux to the electrical angle (1).
16 + 46k / 25) °-(176 + 46k / 25)
° or electrical angle 300 ° -cos ^-1 (k / 10
0) to 360 ° -cos ^-1 (k / 100) °, and the injection time of the third injection phase in which the residual magnetic flux is positive is set to an electrical angle (345-
195k / 100) °-(405-195k / 100)
The phase control switchgear according to claim 2, wherein the angle is set to °. 11. The method according to claim 11, wherein the optimal input point predicting means is configured to generate the Δ
The means for predicting the residual magnetic flux of the reactor component of each phase
The residual magnetic flux of each phase is zero (0%) and negative (residual magnetic flux −k
%), Positive (residual magnetic flux k%)
At the time of closing (closed pole) when the generated surge when each phase is turned on is minimized
When predicting the time (electrical angle), the first input phase
The phase with a negative flux and the second input phase is the phase with no residual magnetic flux (the
1), and the third input phase is set as
And the input time of the first input phase, where the residual magnetic flux is negative,
Any timing and setting at or before the time
And the injection time of the second injection phase in which the residual magnetic flux is zero is set to the electrical angle (-
4 + 46k / 25) ° to (56 + 46k / 25) °,
Alternatively, preferably, the electrical angle is 180 ° -cos ^-1(K /
100) -240 ° -cos^-1At (k / 100) °, the injection time of the third injection phase in which the residual magnetic flux is positive is changed to the electrical angle (3
45-195 k / 100) °-(405-195 k / 1)
(00) °.
Phase control switchgear. 12. The optimum input point predicting means, based on a result that the residual magnetic flux predicting means of the reactor component of each of the Δ-connected phases predicts the residual magnetic flux of each phase to be zero, negative, and positive, respectively. When predicting the closing (pole closing) time (electrical angle) at which the generated surge at the time of the phase closing is minimized, the closing times of the first and second closing phases in which the residual magnetic flux is zero are set to 300 ° to 2400 ° (voltage peak). ) Or in the vicinity of the electrical angle of 120 ° to 60 ° (voltage peak), and further, the injection time of the first and second input phases in which the residual magnetic flux is negative is set to the electrical angle of 60 ° to 30 °, or Electric angle 2
3. The method according to claim 2, wherein the injection time of the third input phase having a positive residual magnetic flux is set at the same time as or later than the input times of the first and second input phases. The phase-controlled switchgear according to claim 1. 13. The optimum input point predicting means, based on a result that the residual magnetic flux predicting means of the reactor component of each of the Δ-connected phases predicts the residual magnetic flux of each phase to be zero, negative, and positive, respectively. When predicting the closing (pole closing) time (electrical angle) at which the generated surge at the time of the phase closing is minimized, the closing times of the first and second closing phases in which the residual magnetic flux is zero are set to the electrical angles of 300 ° to 240 ° ( Voltage peak) or electrical angle of 120 ° to 60 ° (voltage peak), and furthermore, the injection time of the first and second input phases in which the residual magnetic flux is positive is set to an electrical angle of 180 ° to 120 °, or The electrical angle is set to 360 ° to 300 °, and the input time of the third input phase having a negative residual magnetic flux is set at the same time as or later than the input times of the first and second input phases. The phase control switchgear according to claim 2. 14. The optimum input point predicting means, based on a result that the residual magnetic flux predicting means of the reactor component of each of the Δ-connected phases predicts the residual magnetic flux of each phase as zero, negative, and positive, respectively. When predicting the closing (pole closing) time (electrical angle) at which the surge generated at the time of phase closing is minimized, the closing times of the first and second closing phases in which the residual magnetic flux is negative are set to an electrical angle of 60 ° to 0 °. Or electrical angle 240 ° ~ 1
At 80 °, the input time of the first and second input phases in which the residual magnetic flux is positive is set to an electrical angle of 180 ° to 120 ° or an electrical angle of 360 ° to 300 °, and the residual magnetic flux is set to zero. 3. The phase control switchgear according to claim 2, wherein the input time of a certain third input phase is set at the same time as or later than the input times of the first and second input phases. 15. The optimum input point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase, whose neutral point is directly grounded and Y-connected, calculates the residual magnetic flux of each phase by the residual magnetic flux predicting means of each phase. Zero (0%), negative (residual magnetic flux-k%),
Based on the result of prediction as positive (residual magnetic flux k%), when predicting the closing (pole closing) time (electrical angle) at which the surge generated at the time of each phase input is minimum, the first input phase is set to the residual magnetic flux. Is set to zero (first cut-off phase), the second input phase is set to a positive phase of residual magnetic flux, the third input phase is set to a negative phase of residual magnetic flux, and the third phase is set to zero residual magnetic flux. The injection time of one input phase is set to electrical angle 12
Near 0 ° to 60 ° (voltage peak) or 3 electrical angles
In the vicinity of 00 ° to 240 ° (voltage peak), the injection time of the second input phase in which the residual magnetic flux is positive is set to the electrical angle (3
0 ° + 39 ° k / 100) to (90 ° + 39 ° k / 10)
0) or electrical angle (210 ° + 39 ° k / 10
0) to (270 ° + 39 ° k / 100), and the input time of the third input phase having a negative residual magnetic flux is set at the same time as or later than the input time of the second input phase. The phase control switchgear according to claim 2. 16. The optimum input point predicting means includes: a residual magnetic flux predicting means for a reactor component of each phase whose neutral point is directly grounded and Y-connected; Based on the result of predicting that the residual magnetic flux is negative and that the residual magnetic flux of the third interrupting phase is positive, when predicting the closing (pole closing) time (electrical angle) at which the surge generated at the time of each phase is minimized, the first The third input phase is set to a phase with zero residual magnetic flux (first interrupting phase), the second input phase is set to a positive phase with residual magnetic flux, and the third input phase is set to a negative phase with residual magnetic flux. The injection time of the first injection phase in which the residual magnetic flux is zero is set to an electrical angle of 90.
° (voltage peak) or 60 ° to 120 °
(Voltage peak), the input time of the second input phase in which the residual magnetic flux is positive is set to an electrical angle of 75
20. The method according to claim 19, wherein the injection time of the third input phase in which the residual magnetic flux is negative is set at the same time as or later than the input time of the second input phase. 3. The phase control switchgear according to 2. 17. The optimum input point predicting means includes: a residual magnetic flux predicting means for a reactor component of each phase whose neutral point is directly grounded and Y-connected;
When predicting the closing (pole closing) time (electrical angle) at which the surge generated at each phase is minimized based on the results of the prediction of negative (residual magnetic flux-k%) and positive (residual magnetic flux k%), The first input phase is set to a phase in which the residual magnetic flux is zero (first interrupting phase), the second input phase is set to a negative residual magnetic flux phase, and the third input phase is set to a positive residual magnetic flux phase. At the same time, the injection time of the first injection phase in which the residual magnetic flux is zero is
Near 0 ° to 60 ° (voltage peak) or 300
In the vicinity of ° to 240 ° (voltage peak), the injection time of the second injection phase in which the residual magnetic flux is negative is set to the electrical angle (2
70 ° + 39 ° k / 100) to (330 ° + 39 ° k /
100) or electrical angle (90 ° + 39 ° k / 10
0) to (150 ° + 39 ° k / 100), and the input time of the third input phase in which the residual magnetic flux is positive is set at the same time as or later than the input time of the second input phase. The phase control switchgear according to claim 2. 18. The optimum input point predicting means, wherein the residual magnetic flux of the reactor component of each phase whose neutral point is directly grounded and Y-connected has a residual magnetic flux of the first interrupting phase of zero, and a residual magnetic flux of the second interrupting phase. Based on the result of predicting that the residual magnetic flux is negative and that the residual magnetic flux of the third interrupting phase is positive, when predicting the closing (pole closing) time (electrical angle) at which the surge generated at the time of each phase is minimized, the first The third input phase is set to a phase with zero residual magnetic flux (first interrupting phase), the second input phase is set to a negative phase with residual magnetic flux, and the third input phase is set to a positive phase with residual magnetic flux. The injection time of the first input phase in which the residual magnetic flux is zero is set to an electrical angle of 90.
° (voltage peak) or 60 ° to 120 °
(Voltage peak), the injection time of the second injection phase in which the residual magnetic flux is negative
5 ° or an electrical angle of 300 ° to 330 °, and the input time of the third input phase in which the residual magnetic flux is positive is set at the same time as or later than the input time of the second input phase. The phase control switchgear according to claim 2. 19. The optimum input point predicting means includes: a residual magnetic flux predicting means for a reactor component of each phase whose neutral point is directly grounded and Y-connected;
When predicting the closing (pole closing) time (electrical angle) at which the surge generated at each phase closing is minimized based on the result of the prediction of negative (residual magnetic flux-k%) and positive (residual magnetic flux k%), The first input phase is set to a negative residual magnetic flux phase, the second input phase is set to a positive residual magnetic flux phase, and the third input phase is set to a zero residual magnetic flux phase (first cutoff phase). At the same time, the injection time of the first input phase in which the residual magnetic flux is negative (residual magnetic flux-k%) is defined as the electrical angle θ = cos ^-1 (-k / 100) -30 °
Ｃｏcos ⁻¹ (−k / 100) + 30 °, that is, assuming that the residual magnetic flux is k = 100%, the electrical angle is 330 ° (= −30 °).
°) to 30 ° or an electrical angle of 150 ° to 210 °, the injection time of the second input phase in which the residual magnetic flux is positive (residual magnetic flux k%) is set to the electrical angle (84 ° + 39 ° k / 100) to (144).
° + 39 ° k / 100) or electrical angle (264 ° +
39 ° k / 100) to (324 ° + 39 ° k / 100)
The phase control switchgear according to claim 2, wherein the input time of the third input phase in which the residual magnetic flux is zero is set to be the same as or later than the input time of the second input phase. 20. The optimum input point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase, whose neutral point is directly grounded and Y-connected, sets the residual magnetic flux of each phase to zero (0%),
When predicting the closing (pole closing) time (electrical angle) at which the surge generated at each phase is minimized based on the results of the prediction of negative (residual magnetic flux-k%) and positive (residual magnetic flux k%), The first input phase is set to a negative residual magnetic flux phase, the second input phase is set to a zero residual magnetic flux phase (first cutoff phase), and the third input phase is set to a positive residual magnetic flux phase. At the same time, the injection time of the first input phase in which the residual magnetic flux is negative (residual magnetic flux-k%) is defined as the electrical angle θ = cos ⁻¹ (−k / 100) −30 °
Ｃｏcos ⁻¹ (−k / 100) + 30 °, that is, assuming that the residual magnetic flux is k = 100%, the electrical angle is 330 ° (−30 °).
To 30 ° or an electrical angle of 150 ° to 210 °, the injection time of the second input phase in which the residual magnetic flux is zero is set to the electrical angle (2
04 ° + 39 ° k / 100) to (264 ° + 39 ° k /
100) or electrical angle (14 ° + 39 ° k / 10
0) to (74 ° + 39 ° k / 100), and the input time of the third input phase in which the residual magnetic flux is positive is set at the same time as or later than the input time of the second input phase. The phase control switchgear according to claim 2. 21. The optimum input point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase whose neutral point is directly grounded and Y-connected reduces the residual magnetic flux of each phase to zero (0%),
When predicting the closing (pole closing) time (electrical angle) at which the surge generated at the time of each phase is minimized based on the results of the prediction of negative (residual magnetic flux-k%) and positive (residual magnetic flux k%), The first input phase is set to a positive phase of residual magnetic flux, the second input phase is set to a phase of zero residual magnetic flux (first cutoff phase), and the third input phase is set to a negative phase of residual magnetic flux. At the same time, the injection time of the first input phase in which the residual magnetic flux is positive (residual magnetic flux k%) is defined as electrical angle θ = cos ⁻¹ (−k / 100) −30 °
cos ^-1 (-k / 100) + 30 °, that is, assuming that the residual magnetic flux is 100%, the electrical angle is 150 ° to 210 °, or the electrical angle is near 0 ° (zero voltage point), preferably the electrical angle is 33.
From 0 ° (= −30 °) to 30 °, the injection time of the second injection phase in which the residual magnetic flux is zero is set to the electrical angle (9
5 ° + 10 ° k / 100) to (155 ° + 10 ° k / 1)
00) or electrical angle (275 ° + 10 ° k / 10
0) to (335 ° + 10 ° k / 100), and the input time of the third input phase having a negative residual magnetic flux is set to be the same as or later than the input time of the second input phase. The phase control switchgear according to claim 2. 22. The optimum input point predicting means, wherein the residual magnetic flux of the reactor component of each phase whose neutral point is directly grounded and Y-connected is set to zero (0%), respectively.
When predicting the closing (pole closing) time (electrical angle) at which the surge generated at each phase is minimized based on the results of the prediction of negative (residual magnetic flux-k%) and positive (residual magnetic flux k%), The first input phase is set to a positive residual magnetic flux phase, the second input phase is set to a negative residual magnetic flux phase, and the third input phase is set to a zero residual magnetic flux phase (first cutoff phase). At the same time, the injection time of the first input phase in which the residual magnetic flux is positive (residual magnetic flux k%) is defined as the electrical angle θ = cos ⁻¹ (−k / 100) −30 °
cos ^-1 (-k / 100) + 30 °, that is, assuming that the residual magnetic flux is k = 100%, the residual magnetic flux becomes an electrical angle of 150 ° to 210 ° or an electrical angle of 330 ° (= −30 °) to 30 °. Is the electrical angle (2
15 ° + 10 ° k / 100) to (275 ° + 10 ° k /
100) or electrical angle (35 ° + 10 ° k / 10
0) to (95 ° + 10 ° k / 100), and the input time of the third input phase having a residual magnetic flux of zero is set at the same time as or later than the input time of the second input phase. The phase control switchgear according to claim 2. 23. The optimum input point predicting means predicts the residual magnetic flux of each phase to be zero, negative, and positive, respectively, by the residual magnetic flux predicting means of the reactor component of each phase whose neutral point is directly grounded and Y-connected. Based on the results, when predicting the closing (pole closing) time (electrical angle) at which the generated surge at each phase closing is minimum, the closing time of the first and second closing phases with zero residual magnetic flux is determined by the electrical angle. In the vicinity of 300 ° to 240 ° (voltage peak) or in the vicinity of 120 ° to 60 ° electrical peak (voltage peak), the injection time of the first and second input phases in which the residual magnetic flux is negative is set to the electrical angle of 60 °. 0 ° from or electrical angle 240
3. The method according to claim 2, wherein the angle is set to 180 ° and the closing time of the third input phase in which the residual magnetic flux is positive is set to be the same as or later than the closing times of the first and second input phases. A phase control switchgear according to any of the preceding claims. 24. The optimum input point predicting means predicts the residual magnetic flux of each phase to be zero, negative, and positive, respectively, by the residual magnetic flux predicting means of the reactor component of each phase whose neutral point is directly grounded and Y-connected. Based on the results, when predicting the closing (pole closing) time (electric angle) at which the generated surge at the time of each phase closing becomes minimum, the closing time of the first and second closing phases in which the residual magnetic flux is zero is determined by the electrical angle. In the vicinity of 300 ° to 240 ° (voltage peak) or in the vicinity of 120 ° to 60 ° electrical peak (voltage peak), the injection time of the first and second input phases in which the residual magnetic flux is positive is set to 180 ° electrical angle. And the electrical angle is set to 360 ° to 300 °, and the input time of the third input phase having a negative residual magnetic flux is set to be the same as or later than the input times of the first and second input phases. The position according to claim 2, characterized in that: Control switching device. 25. The optimum input point predicting means predicts the residual magnetic flux of each phase to be zero, negative, and positive, respectively, by the residual magnetic flux predicting means of the reactor component of each phase of the Y connection whose neutral point is directly grounded. When predicting the closing (pole closing) time (electrical angle) at which the generated surge at the time of each phase closing is minimized based on the results, the closing times of the first and second closing phases having a negative residual magnetic flux are determined by the electrical angle. 60 ° to 0 ° or electrical angle 240 ° to 18
0 °, and the input time of the first and second input phases in which the residual magnetic flux is positive is set to an electrical angle of 180 ° to 120 ° or an electrical angle of 360 ° to 300 °, and the residual magnetic flux is set to zero. 3. The phase control switchgear according to claim 2, wherein the input time of a certain third input phase is set at the same time as or later than the input times of the first and second input phases. 26. The optimal closing point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase of the Y connection whose neutral point is directly grounded sets the residual magnetic flux of the first breaking phase to zero and the residual magnetic flux of the second breaking phase to zero. Based on the result of predicting that the residual magnetic flux is positive and that the residual magnetic flux of the third interrupting phase is negative, when predicting the closing (pole closing) time (electrical angle) at which the surge generated at the time of each phase is minimized, the first The third input phase is set to a phase with zero residual magnetic flux, the second input phase is set to a positive phase with residual magnetic flux, the third input phase is set to a negative phase with residual magnetic flux, and the residual magnetic flux is zero. The input time of the first input phase is set to an electrical angle of 90.
° (voltage peak) or electrical angle of 60 ° to 12 °
At 0 °, the injection time of the second injection phase in which the residual magnetic flux is positive is set to an electrical angle of 28.
The input time of the third input phase having a negative residual magnetic flux is set at about 0 ° or at an electrical angle of 260 ° to 300 ° at the same time as or later than the input time of the second input phase. Item 3. The phase control switchgear according to Item 2. 27. The optimum closing point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase of the Y connection in which the neutral point is directly grounded sets the residual magnetic flux of the first interrupting phase to zero and the residual magnetic flux of the second interrupting phase. Based on the result of predicting that the residual magnetic flux is positive and that the residual magnetic flux of the third interrupting phase is negative, when predicting the closing (pole closing) time (electrical angle) at which the surge generated at the time of each phase is minimized, the first The third input phase is set to a zero residual magnetic flux phase, the second input phase is set to a negative residual magnetic flux phase, the third input phase is set to a positive residual magnetic flux phase, and the third input phase is set to a zero residual magnetic flux phase. The injection time of one injection phase is 90 electrical angles.
° (voltage peak) or electrical angle of 60 ° to 12 °
0 °, the input time of the second input phase in which the residual magnetic flux is negative is set to a value close to the electrical angle of 40 ° or an electrical angle of 20 ° to 60 °,
3. The phase control switchgear according to claim 2, wherein the closing time of the third input phase in which the residual magnetic flux is positive is set to be the same as or later than the input time of the second input phase. 28. The optimum input point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase of the Y connection of each Y connection of which the neutral point is not connected to the ground is set to zero ( 0%), negative (residual magnetic flux-k%), positive (residual magnetic flux k%)
When predicting the closing (pole closing) time (electrical angle) at which the surge generated when each phase is turned on is minimized based on the predicted result, the first turning-on phase is a phase in which the residual magnetic flux is a positive phase, The third input phase is set to a negative residual magnetic flux phase, the third input phase is set to a zero residual magnetic flux phase (first cutoff phase), and the input time of the first input phase in which the residual magnetic flux is positive is set. An arbitrary timing is set at the same time as or before the second phase input time, and the input time of the second input phase in which the residual magnetic flux is negative is set to an electrical angle of 60.
Between 0 ° and 0 °, the injection time of the third injection phase in which the residual magnetic flux is zero is set to an electrical angle of 12 °.
Near 0 ° to 60 ° (voltage peak) or 3 electrical angles
The phase control switchgear according to claim 2, wherein the phase control switchgear is set near 00 ° to 240 ° (voltage peak). 29. The optimal input point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase of the Y connection in which the neutral point is not connected to the ground is set to zero (0%), negative ( When predicting the closing (pole closing) time (electrical angle) at which the generated surge at each phase closing is minimized, based on the result of the prediction of the residual magnetic flux −k%) and the positive (residual magnetic flux k%), The first input phase is set to a negative residual magnetic flux phase, the second input phase is set to a positive residual magnetic flux phase, and the third input phase is set to a zero residual magnetic flux phase (first cutoff phase). The input time of the first input phase in which the residual magnetic flux is negative is set to an arbitrary timing at the same time as or earlier than the input time of the second phase, and the input time of the second input phase in which the residual magnetic flux is positive is set to an electrical angle. 18
At 0 ° to 120 °, the injection time of the third injection phase in which the residual magnetic flux is zero is set to an electrical angle of 12 °.
0 ° to 60 ° or electrical angle 300 ° to 240 °
3. The phase control switchgear according to claim 2, wherein the value is set to. 30. The optimum input point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase of the Y connection in which the neutral point is not connected to the ground is set to zero (0%), negative ( When estimating the closing (pole closing) time (electrical angle) at which the surge generated at the time of each phase injection is minimized based on the result of the prediction of the residual magnetic flux −k%) and the positive (residual magnetic flux k%), the first The third input phase is set to a positive residual magnetic flux phase, the second input phase is set to a zero residual magnetic flux phase (first interrupting phase), and the third input phase is set to a negative residual magnetic flux phase. The first where the residual magnetic flux is positive
The input time of the input phase is set to an arbitrary timing before or at the same time as the input time of the second phase, and the input time of the second input phase in which the residual magnetic flux is zero is set to an electrical angle of 30.
0 ° to 240 °, the injection time of the third injection phase in which the residual magnetic flux is negative is set to the electrical angle (2
3. The phase control switchgear according to claim 2, wherein the angle is set to 72-k / 5) ° to (332-k / 5) °. 4. 31. The optimum input point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase of the Y connection in which the neutral point is not connected to the ground is set to zero (0%), negative ( When estimating the closing (pole closing) time (electrical angle) at which the surge generated at the time of each phase injection is minimized based on the result of the prediction of the residual magnetic flux −k%) and the positive (residual magnetic flux k%), the first The third input phase is set to a phase with zero residual magnetic flux (first interrupting phase), the second input phase is set to a positive phase with residual magnetic flux, and the third input phase is set to a negative phase with residual magnetic flux. The first where the residual magnetic flux is zero
The input time of the input phase is set to an arbitrary timing at the same time as or earlier than the input time of the second phase, and the input time of the second input phase in which the residual magnetic flux is positive is set to the electrical angle 18.
At 0 ° to 120 °, the injection time of the third injection phase in which the residual magnetic flux is negative is set to the electrical angle (2
3. The phase control switchgear according to claim 2, wherein the angle is set to 72-k / 5) ° to (332-k / 5) °. 4. 32. The optimum input point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase of the Y connection in which the neutral point is not connected to the ground is set to zero (0%), negative ( When estimating the closing (pole closing) time (electrical angle) at which the surge generated at the time of each phase injection is minimized based on the result of the prediction of the residual magnetic flux −k%) and the positive (residual magnetic flux k%), the first The third input phase is set to a phase with zero residual magnetic flux (first interrupting phase), the second input phase is set to a negative phase with residual magnetic flux, and the third input phase is set to a positive phase with residual magnetic flux. The first where the residual magnetic flux is zero
The input time of the input phase is set to an arbitrary timing before or at the same time as the input time of the second phase, and the input time of the second input phase in which the residual magnetic flux is negative is set to an electrical angle of 60.
0 to 0 °, the injection time of the third injection phase in which the residual magnetic flux is positive is set to the electrical angle (3
45-195 k / 100) °-(405-195 k / 1)
The phase control switchgear according to claim 2, wherein the angle is set to (00) °. 33. The optimum input point predicting means, wherein the residual magnetic flux predicting means of the reactor component of each phase of the Y connection in which the neutral point is not connected to the ground is set to zero (0%), negative ( When predicting the closing (pole closing) time (electrical angle) at which the surge generated when each phase is turned on is minimized, based on the results of the prediction of the residual magnetic flux-k%) and the positive (residual magnetic flux k%), the first The third input phase is set as a negative phase (first interrupting phase), the third input phase is set as a positive phase, and the third input phase is set as a positive phase. The input time of the first input phase in which the residual magnetic flux is negative is set at the same time as or earlier than the input time of the second phase, and the input time of the second input phase in which the residual magnetic flux is zero is set to an electrical angle of 30.
0 ° to 240 °, the injection time of the third injection phase in which the residual magnetic flux is positive is set to the electrical angle (3
45-195 k / 100) °-(405-195 k / 1)
The phase control switchgear according to claim 2, wherein the angle is set to (00) °. 34. The optimum input point predicting means predicts the residual magnetic flux of each phase to be zero, negative, and positive, respectively, by the residual magnetic flux predicting means of the reactor component of each phase of the Y connection in which the neutral point is not connected to the ground. Based on the results, when predicting the closing (pole closing) time (electrical angle) at which the generated surge at each phase closing is minimum, the closing time of the first and second closing phases with zero residual magnetic flux is determined by the electrical angle. In the range of 300 ° to 240 ° (voltage peak) or in the vicinity of the electrical angle of 120 ° to 60 ° (voltage peak), the input time of the first and second input phases in which the residual magnetic flux is negative is set to an electrical angle of 60 ° to 0 ° or electrical angle 24
3. The method according to claim 2, wherein the setting is performed at 0 ° to 180 °, and the input time of the third input phase having a positive residual magnetic flux is set at the same time as or later than the input times of the first and second input phases. The phase-controlled switchgear according to claim 1. 35. The optimum input point predicting means predicts the residual magnetic flux of each phase to be zero, negative, and positive, respectively, by the residual magnetic flux predicting means of the reactor component of each phase of the Y connection in which the neutral point is not connected to the ground. Based on the results, when predicting the closing (pole closing) time (electric angle) at which the generated surge at the time of each phase closing becomes minimum, the closing time of the first and second closing phases in which the residual magnetic flux is zero is determined by the electrical angle. In the vicinity of 270 ° to 300 ° (voltage peak) or in the vicinity of 120 ° to 60 ° (voltage peak), the input time of the first and second input phases in which the residual magnetic flux is positive is set to 180 electrical degrees. ~ 120 ° or electrical angle 36
3. The method according to claim 2, wherein the injection time of the third input phase having a negative residual magnetic flux is set at the same time as or later than the input times of the first and second input phases. The phase-controlled switchgear according to claim 1. 36. The optimum input point predicting means predicts the residual magnetic flux of each phase to be zero, negative, and positive, respectively, by the residual magnetic flux predicting means of each phase of the reactor component of the Y connection in which the neutral point is not connected to the ground. When predicting the closing (pole closing) time (electrical angle) at which the generated surge at the time of each phase closing is minimized based on the result, the closing times of the first and second closing phases in which the residual magnetic flux is negative are determined by the electrical angle. 60 ° -0 ° or 240 ° -180 ° electrical angle
Further, the input time of the first and second input phases in which the residual magnetic flux is positive is set to an electrical angle of 180 ° to 120 ° or an electrical angle of 3 °.
3. The method according to claim 2, wherein the setting is performed at 60 ° to 300 °, and the input time of the third input phase having a residual magnetic flux of zero is set at the same time as or later than the input times of the first and second input phases. The phase-controlled switchgear according to claim 1.